Create Table <name> (…) ON …

 Where [OrderDate] Between …

USE [PartitionDB]
GO
CREATE PARTITION FUNCTION pfOrderDateRange(DATETIME)
AS
RANGE LEFT FOR VALUES ('2010/12/31','2011/12/31','2012/12/31')
GO
CREATE PARTITION SCHEME psOrderDateRange
AS
PARTITION pfOrderDateRange TO (FG1,FG2,FG3,[PRIMARY])
GO

CREATE TABLE Orders
(
OrderID INT IDENTITY(1,1) NOT NULL,
OrderDate DATETIME NOT NULL,
OrderFreight MONEY NULL,
ProductID INT NULL,
CONSTRAINT PK_Orders PRIMARY KEY CLUSTERED (OrderID ASC, OrderDate ASC)
ON psOrderDateRange (OrderDate)
) ON psOrderDateRange (OrderDate)
GO

SET NOCOUNT ON
DECLARE @OrderDate DATETIME
DECLARE @X INT
SET @OrderDate = '2010/01/01'
SET @X = 0
WHILE @X < 300
BEGIN
INSERT dbo.Orders ( OrderDate, OrderFreight, ProductID)
VALUES( @OrderDate + @X, @X + 10, @X)
 SET @X = @X + 1
END
GO
SET NOCOUNT ON
DECLARE @OrderDate DATETIME
DECLARE @X INT
SET @OrderDate = '2011/01/01'
SET @X = 0
WHILE @X < 300
BEGIN
INSERT dbo.Orders ( OrderDate, OrderFreight, ProductID)
VALUES( @OrderDate + @X, @X + 10, @X)
 SET @X = @X + 1
END
GO
SET NOCOUNT ON
DECLARE @OrderDate DATETIME
DECLARE @X INT
SET @OrderDate = '2012/01/01'
SET @X = 0
WHILE @X < 300
BEGIN
INSERT dbo.Orders ( OrderDate, OrderFreight, ProductID)
VALUES( @OrderDate + @X, @X + 10, @X)
 SET @X = @X + 1
END
GO

USE [PartitionDB]
GO
SELECT OBJECT_NAME(i.object_id) AS OBJECT_NAME,
p.partition_number, fg.NAME AS FILEGROUP_NAME, ROWS, au.total_pages,
CASE boundary_value_on_right
WHEN 1 THEN 'Less than'
ELSE 'Less or equal than' END AS 'Comparition',VALUE
FROM sys.partitions p JOIN sys.indexes i
ON p.object_id = i.object_id AND p.index_id = i.index_id
JOIN sys.partition_schemes ps ON ps.data_space_id = i.data_space_id
JOIN sys.partition_functions f ON f.function_id = ps.function_id
LEFT JOIN sys.partition_range_values rv
ON f.function_id = rv.function_id
AND p.partition_number = rv.boundary_id
JOIN sys.destination_data_spaces dds
ON dds.partition_scheme_id = ps.data_space_id
AND dds.destination_id = p.partition_number
JOIN sys.filegroups fg
ON dds.data_space_id = fg.data_space_id
JOIN (SELECT container_id, SUM(total_pages) AS total_pages
FROM sys.allocation_units
GROUP BY container_id) AS au
ON au.container_id = p.partition_id WHERE i.index_id < 2

/* Query 2-3- Split a partition*/
-- Add FG4:
ALTER DATABASE PartitionDB ADD FILEGROUP FG4
Go
ALTER PARTITION SCHEME [psOrderDateRange] NEXT USED FG4
GO
ALTER PARTITION FUNCTION [pfOrderDateRange]() SPLIT RANGE('2013/12/31')
GO
-- Add Partition 4 (P4) to FG4:
GO
ALTER DATABASE PartitionDB ADD FILE
(
NAME = P4,
FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\P4.NDF'
, SIZE = 1024KB , MAXSIZE = UNLIMITED, FILEGROWTH = 10%)
 TO FILEGROUP [FG4]
--
GO

SET NOCOUNT ON
DECLARE @OrderDate DATETIME
DECLARE @X INT
SET @OrderDate = '2013/01/01'
SET @X = 0
WHILE @X < 300
BEGIN
INSERT dbo.Orders ( OrderDate, OrderFreight, ProductID)
VALUES( @OrderDate + @X, @X + 10, @X)
 SET @X = @X + 1
END
GO
SET NOCOUNT ON
DECLARE @OrderDate DATETIME
DECLARE @X INT
SET @OrderDate = '2012/01/01'
SET @X = 0
WHILE @X < 300
BEGIN
INSERT dbo.Orders ( OrderDate, OrderFreight, ProductID)
VALUES( @OrderDate + @X, @X + 10, @X)
 SET @X = @X + 1
END
GO

/* Query 2-4- Merge Partitions */
ALTER PARTITION FUNCTION [pfOrderDateRange]() MERGE RANGE('2010/12/31')
Go

/* Query 2-5- Switch Partitions */
USE [PartitionDB]
GO
CREATE TABLE [dbo].[Orders_Temp](
[OrderID] [int] IDENTITY(1,1) NOT NULL,
[OrderDate] [datetime] NOT NULL,
[OrderFreight] [money] NULL,
[ProductID] [int] NULL,
 CONSTRAINT [PK_OrdersTemp] PRIMARY KEY CLUSTERED ([OrderID] ASC,[OrderDate] ASC)ON FG2
) ON FG2
GO
USE [tempdb]
GO
CREATE TABLE [dbo].[Orders_Hist](
[OrderID] [int] NOT NULL,
[OrderDate] [datetime] NOT NULL,
[OrderFreight] [money] NULL,
[ProductID] [int] NULL,
 CONSTRAINT [PK_OrdersTemp] PRIMARY KEY CLUSTERED ([OrderID] ASC,[OrderDate] ASC)
)
GO
USE [PartitionDB]
GO
ALTER TABLE [dbo].[Orders] SWITCH PARTITION 1 TO [dbo].[Orders_Temp]
GO
INSERT INTO [tempdb].[dbo].[Orders_Hist]
SELECT * FROM  [dbo].[Orders_Temp]
GO
DROP TABLE [dbo].[Orders_Temp]
GO
SELECT * FROM [tempdb].[dbo].[Orders_Hist]

using System;
using System.Web;

namespace OPMLCleaner
{
    public static class UrlNormalization
    {
        public static bool AreTheSameUrls(this string url1, string url2)
        {
            url1 = url1.NormalizeUrl();
            url2 = url2.NormalizeUrl();
            return url1.Equals(url2);
        }

        public static bool AreTheSameUrls(this Uri uri1, Uri uri2)
        {
            var url1 = uri1.NormalizeUrl();
            var url2 = uri2.NormalizeUrl();
            return url1.Equals(url2);
        }

        public static string[] DefaultDirectoryIndexes = new[]
            {
                "default.asp",
                "default.aspx",
                "index.htm",
                "index.html",
                "index.php"
            };

        public static string NormalizeUrl(this Uri uri)
        {
            var url = urlToLower(uri);
            url = limitProtocols(url);
            url = removeDefaultDirectoryIndexes(url);
            url = removeTheFragment(url);
            url = removeDuplicateSlashes(url);
            url = addWww(url);
            url = removeFeedburnerPart(url);
            return removeTrailingSlashAndEmptyQuery(url);
        }

        public static string NormalizeUrl(this string url)
        {
            return NormalizeUrl(new Uri(url));
        }

        private static string removeFeedburnerPart(string url)
        {
            var idx = url.IndexOf("utm_source=", StringComparison.Ordinal);
            return idx == -1 ? url : url.Substring(0, idx - 1);
        }

        private static string addWww(string url)
        {
            if (new Uri(url).Host.Split('.').Length == 2 && !url.Contains("://www."))
            {
                return url.Replace("://", "://www.");
            }
            return url;
        }

        private static string removeDuplicateSlashes(string url)
        {
            var path = new Uri(url).AbsolutePath;
            return path.Contains("//") ? url.Replace(path, path.Replace("//", "/")) : url;
        }

        private static string limitProtocols(string url)
        {
            return new Uri(url).Scheme == "https" ? url.Replace("https://", "http://") : url;
        }

        private static string removeTheFragment(string url)
        {
            var fragment = new Uri(url).Fragment;
            return string.IsNullOrWhiteSpace(fragment) ? url : url.Replace(fragment, string.Empty);
        }

        private static string urlToLower(Uri uri)
        {
            return HttpUtility.UrlDecode(uri.AbsoluteUri.ToLowerInvariant());
        }

        private static string removeTrailingSlashAndEmptyQuery(string url)
        {
            return url
                    .TrimEnd(new[] { '?' })
                    .TrimEnd(new[] { '/' });
        }

        private static string removeDefaultDirectoryIndexes(string url)
        {
            foreach (var index in DefaultDirectoryIndexes)
            {
                if (url.EndsWith(index))
                {
                    url = url.TrimEnd(index.ToCharArray());
                    break;
                }
            }
            return url;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<opml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" version="1.0">
  <body>
    <outline text="آی تی ایرانی">
    <outline type="rss" 
                           text="‫فید کلی آخرین نظرات، مطالب، اشتراک‌ها و پروژه‌های .NET Tips" 
                           title="‫فید کلی آخرین نظرات، مطالب، اشتراک‌ها و پروژه‌های .NET Tips" 
                           xmlUrl="https://www.dntips.ir/Feed/LatestChanges"
                           htmlUrl="https://www.dntips.ir/" />
    </outline> 
  </body>
</opml>

using System.Xml.Serialization;

namespace OPMLCleaner
{
    [XmlType(TypeName="outline")]
    public class Opml
    {
        [XmlAttribute(AttributeName="text")]
        public string Text { get; set; }

        [XmlAttribute(AttributeName = "title")]
        public string Title { get; set; }

        [XmlAttribute(AttributeName = "type")]
        public string Type { get; set; }

        [XmlAttribute(AttributeName = "xmlUrl")]
        public string XmlUrl { get; set; }

        [XmlAttribute(AttributeName = "htmlUrl")]
        public string HtmlUrl { get; set; }
    }
}

var document = XDocument.Load("it-92-03-01.opml");
var results = (from node in document.Descendants("outline")
                           where node.Attribute("htmlUrl") != null && node.Parent.Attribute("text") != null 
                            && node.Parent.Attribute("text").Value == "آی تی ایرانی"
                           select new Opml
                           {
                               HtmlUrl = (string)node.Attribute("htmlUrl"),
                               Text = (string)node.Attribute("text"),
                               Title = (string)node.Attribute("title"),
                               Type = (string)node.Attribute("type"),
                               XmlUrl = (string)node.Attribute("xmlUrl")
                           }).ToList();

using System.Collections.Generic;

namespace OPMLCleaner
{
    public class OpmlCompare : EqualityComparer<Opml>
    {
        public override bool Equals(Opml x, Opml y)
        {
            return UrlNormalization.AreTheSameUrls(x.HtmlUrl, y.HtmlUrl);                
        }

        public override int GetHashCode(Opml obj)
        {
            return obj.HtmlUrl.GetHashCode();
        }
    }
}

 var distinctResults = results.Distinct(new OpmlCompare()).ToList();

 public static IPdfReportData CreatePdfReport(Order order, int languageId)
        {
            if (order == null)
                throw new ArgumentNullException("order");



            Language lang = IoC.Resolve<ILanguageService>().GetLanguageById(languageId);

            if (lang == null)
                throw new NopException("Language could not be loaded");

            var localizationManager = IoC.Resolve<ILocalizationManager>();
            var orderProductVariants = order.OrderProductVariants;
            return new PdfReport().DocumentPreferences(doc =>
            {
                doc.RunDirection(PdfRunDirection.LeftToRight);
                doc.Orientation(PageOrientation.Portrait);
                doc.PageSize(PdfPageSize.A4);
                doc.DocumentMetadata(new DocumentMetadata { Author = "coponet", Application = "coponet eshop", Keywords = "Factor", Subject = "Factor", Title = "Factor" });
                doc.Compression(new CompressionSettings
                {
                    EnableCompression = true,
                    EnableFullCompression = true
                });
                doc.PrintingPreferences(new PrintingPreferences
                {
                    ShowPrintDialogAutomatically = false
                });
            })
            .DefaultFonts(fonts =>
            {
                fonts.Path(Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\arial.ttf",
                                  Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\verdana.ttf");
            })
            .PagesFooter(footer =>
            {
                footer.DefaultFooter(CalenderHelper.dateTimeParseToString("yyyy/MM/dd", order.CreatedOn, CalenderEnum.PersianCalender));
            })
            .PagesHeader(header =>
            {
                header.DefaultHeader(defaultHeader =>
                {
                    defaultHeader.RunDirection(PdfRunDirection.LeftToRight);
                    //defaultHeader.ImagePath(AppPath.ApplicationPath + "\\Images\\01.png");
                    defaultHeader.Message("Our new rpt.");
                });
            })
            .MainTableTemplate(template =>
            {
                template.BasicTemplate(BasicTemplate.ClassicTemplate);
            })
            .MainTablePreferences(table =>
            {
                table.ColumnsWidthsType(TableColumnWidthType.Relative);
                table.NumberOfDataRowsPerPage(1);
            })
            .MainTableDataSource(dataSource =>
            {
                //var listOfRows = new List<User>();
                //for (int i = 0; i < 40; i++)
                //{
                //    listOfRows.Add(new User {Id = i});
                //}
                //dataSource.StronglyTypedList(listOfRows);
                dataSource.StronglyTypedList(orderProductVariants);
            })
            )
            .MainTableEvents(events =>
            {
                events.DataSourceIsEmpty(message: "There is no data available to display.");
            })
           ).Generate(data => data.AsPdfFile(string.Format("{0}\\documents\\Temp\\Factor-{1}.pdf", HttpRuntime.AppDomainAppPath, order.OrderId)));
        }

React.js Real-World Projects
46 videos 

var count = context.Facilities.Count();

var count = context.Facilities.Count(x => x.GuestCost >= 10);

var members = context.Members
                        .Where(member => member.RecommendedBy != null)
                        .GroupBy(member => member.RecommendedBy)
                        .Select(group => new
                        {
                            RecommendedBy = group.Key,
                            Count = group.Count()
                        })
                        .OrderBy(result => result.RecommendedBy)
                        .ToList();

var facilities = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.FacId)
                                    .ToList();

var date1 = new DateTime(2012, 09, 01);
var date2 = new DateTime(2012, 10, 01);

var facilities = context.Bookings
                                    .Where(booking => booking.StartTime >= date1
                                                        && booking.StartTime < date2)
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.TotalSlots)
                                    .ToList();

var date1 = new DateTime(2012, 01, 01);
var date2 = new DateTime(2013, 01, 01);

var facilities = context.Bookings
                                    .Where(booking => booking.StartTime >= date1
                                                        && booking.StartTime < date2)
                                    .GroupBy(booking => new { booking.FacId, booking.StartTime.Month })
                                    .Select(group => new
                                    {
                                        group.Key.FacId,
                                        group.Key.Month,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderBy(result => result.FacId)
                                        .ThenBy(result => result.Month)
                                    .ToList();

var count = context.Bookings.Select(booking => booking.MemId).Distinct().Count();

var facilities = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .Where(result => result.TotalSlots > 1000)
                                    .OrderBy(result => result.FacId)
                                    .ToList();

 var facilities =
                            context.Bookings.Select(booking =>
                                new
                                {
                                    booking.Facility.Name,
                                    Revenue = booking.MemId == 0 ?
                                            booking.Slots * booking.Facility.GuestCost
                                            : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => b.Name)
                                .Select(group => new
                                {
                                    Name = group.Key,
                                    TotalRevenue = group.Sum(b => b.Revenue)
                                })
                                .OrderBy(result => result.TotalRevenue)
                                .ToList();

var facilities =
                            context.Bookings.Select(booking =>
                                new
                                {
                                    booking.Facility.Name,
                                    Revenue = booking.MemId == 0 ?
                                            booking.Slots * booking.Facility.GuestCost
                                            : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => b.Name)
                                .Select(group => new
                                {
                                    Name = group.Key,
                                    TotalRevenue = group.Sum(b => b.Revenue)
                                })
                                .Where(result => result.TotalRevenue < 1000)
                                .OrderBy(result => result.TotalRevenue)
                                .ToList();

var item = context.Bookings
                                    .GroupBy(booking => booking.FacId)
                                    .Select(group => new
                                    {
                                        FacId = group.Key,
                                        TotalSlots = group.Sum(booking => booking.Slots)
                                    })
                                    .OrderByDescending(result => result.TotalSlots)
                                    .FirstOrDefault();

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace BlazorServer.Entities
{
    public class RoomOrderDetail
    {
        public int Id { get; set; }

        [Required]
        public string UserId { get; set; }

        [Required]
        public string StripeSessionId { get; set; }

        public DateTime CheckInDate { get; set; }

        public DateTime CheckOutDate { get; set; }

        public DateTime ActualCheckInDate { get; set; }

        public DateTime ActualCheckOutDate { get; set; }

        public long TotalCost { get; set; }

        public int RoomId { get; set; }

        public bool IsPaymentSuccessful { get; set; }

        [Required]
        public string Name { get; set; }

        [Required]
        public string Email { get; set; }

        public string Phone { get; set; }

        [ForeignKey("RoomId")]
        public HotelRoom HotelRoom { get; set; }

        public string Status { get; set; }
    }
}

namespace BlazorServer.Common
{
    public static class BookingStatus
    {
        public const string Pending = "Pending";
        public const string Booked = "Booked";
        public const string CheckedIn = "CheckedIn";
        public const string CheckedOutCompleted = "CheckedOut";
        public const string NoShow = "NoShow";
        public const string Cancelled = "Cancelled";
    }
}

namespace BlazorServer.DataAccess
{
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public DbSet<RoomOrderDetail> RoomOrderDetails { get; set; }

        // ...
    }
}

dotnet tool update --global dotnet-ef --version 5.0.4
dotnet build
dotnet ef migrations --startup-project ../../BlazorWasm/BlazorWasm.WebApi/ add AddRoomOrderDetails --context ApplicationDbContext
dotnet ef --startup-project ../../BlazorWasm/BlazorWasm.WebApi/ database update --context ApplicationDbContext

using System;
using System.ComponentModel.DataAnnotations;

namespace BlazorServer.Models
{
    public class RoomOrderDetailsDTO
    {
        public int Id { get; set; }

        [Required]
        public string UserId { get; set; }

        [Required]
        public string StripeSessionId { get; set; }

        [Required]
        public DateTime CheckInDate { get; set; }

        [Required]
        public DateTime CheckOutDate { get; set; }

        public DateTime ActualCheckInDate { get; set; }

        public DateTime ActualCheckOutDate { get; set; }

        [Required]
        public long TotalCost { get; set; }

        [Required]
        public int RoomId { get; set; }

        public bool IsPaymentSuccessful { get; set; }

        [Required]
        public string Name { get; set; }

        [Required]
        public string Email { get; set; }

        public string Phone { get; set; }

        public HotelRoomDTO HotelRoomDTO { get; set; }

        public string Status { get; set; }
    }
}

namespace BlazorServer.Models.Mappings
{
    public class MappingProfile : Profile
    {
        public MappingProfile()
        {
            // ... 
            CreateMap<RoomOrderDetail, RoomOrderDetailsDTO>().ReverseMap(); // two-way mapping
        }
    }
}

namespace BlazorServer.Services
{
    public interface IRoomOrderDetailsService
    {
        Task<RoomOrderDetailsDTO> CreateAsync(RoomOrderDetailsDTO details);

        Task<List<RoomOrderDetailsDTO>> GetAllRoomOrderDetailsAsync();

        Task<RoomOrderDetailsDTO> GetRoomOrderDetailAsync(int roomOrderId);

        Task<bool> IsRoomBookedAsync(int RoomId, DateTime checkInDate, DateTime checkOutDate);

        Task<RoomOrderDetailsDTO> MarkPaymentSuccessfulAsync(int id);

        Task<bool> UpdateOrderStatusAsync(int RoomOrderId, string status);
    }
}

namespace BlazorServer.Services
{
    public class RoomOrderDetailsService : IRoomOrderDetailsService
    {
        private readonly ApplicationDbContext _dbContext;
        private readonly IMapper _mapper;
        private readonly IConfigurationProvider _mapperConfiguration;

        public RoomOrderDetailsService(ApplicationDbContext dbContext, IMapper mapper)
        {
            _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
            _mapperConfiguration = mapper.ConfigurationProvider;
        }

        public async Task<RoomOrderDetailsDTO> CreateAsync(RoomOrderDetailsDTO details)
        {
            var roomOrder = _mapper.Map<RoomOrderDetail>(details);
            roomOrder.Status = BookingStatus.Pending;
            var result = await _dbContext.RoomOrderDetails.AddAsync(roomOrder);
            await _dbContext.SaveChangesAsync();
            return _mapper.Map<RoomOrderDetailsDTO>(result.Entity);
        }

        public Task<List<RoomOrderDetailsDTO>> GetAllRoomOrderDetailsAsync()
        {
            return _dbContext.RoomOrderDetails
                            .Include(roomOrderDetail => roomOrderDetail.HotelRoom)
                            .ProjectTo<RoomOrderDetailsDTO>(_mapperConfiguration)
                            .ToListAsync();
        }

        public async Task<RoomOrderDetailsDTO> GetRoomOrderDetailAsync(int roomOrderId)
        {
            var roomOrderDetailsDTO = await _dbContext.RoomOrderDetails
                                            .Include(u => u.HotelRoom)
                                                .ThenInclude(x => x.HotelRoomImages)
                                            .ProjectTo<RoomOrderDetailsDTO>(_mapperConfiguration)
                                            .FirstOrDefaultAsync(u => u.Id == roomOrderId);

            roomOrderDetailsDTO.HotelRoomDTO.TotalDays =
                roomOrderDetailsDTO.CheckOutDate.Subtract(roomOrderDetailsDTO.CheckInDate).Days;
            return roomOrderDetailsDTO;
        }

        public Task<bool> IsRoomBookedAsync(int RoomId, DateTime checkInDate, DateTime checkOutDate)
        {
            return _dbContext.RoomOrderDetails
                .AnyAsync(
                    roomOrderDetail =>
                        roomOrderDetail.RoomId == RoomId &&
                        roomOrderDetail.IsPaymentSuccessful &&
                        (
                            (checkInDate < roomOrderDetail.CheckOutDate && checkInDate > roomOrderDetail.CheckInDate) ||
                            (checkOutDate > roomOrderDetail.CheckInDate && checkInDate < roomOrderDetail.CheckInDate)
                        )
                );
        }

        public Task<RoomOrderDetailsDTO> MarkPaymentSuccessfulAsync(int id)
        {
            throw new NotImplementedException();
        }

        public Task<bool> UpdateOrderStatusAsync(int RoomOrderId, string status)
        {
            throw new NotImplementedException();
        }
    }
}

namespace BlazorWasm.WebApi
{
    public class Startup
    {
        // ...

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IRoomOrderDetailsService, RoomOrderDetailsService>();
            // ...

namespace BlazorWasm.Client.Services
{
    public interface IClientRoomOrderDetailsService
    {
        Task<RoomOrderDetailsDTO> MarkPaymentSuccessfulAsync(RoomOrderDetailsDTO details);
        Task<RoomOrderDetailsDTO> SaveRoomOrderDetailsAsync(RoomOrderDetailsDTO details);
    }
}

namespace BlazorWasm.Client.Services
{
    public class ClientRoomOrderDetailsService : IClientRoomOrderDetailsService
    {
        private readonly HttpClient _httpClient;

        public ClientRoomOrderDetailsService(HttpClient httpClient)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
        }

        public Task<RoomOrderDetailsDTO> MarkPaymentSuccessfulAsync(RoomOrderDetailsDTO details)
        {
            throw new NotImplementedException();
        }

        public Task<RoomOrderDetailsDTO> SaveRoomOrderDetailsAsync(RoomOrderDetailsDTO details)
        {
            throw new NotImplementedException();
        }
    }
}

namespace BlazorWasm.Client
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            // ...
            builder.Services.AddScoped<IClientRoomOrderDetailsService, ClientRoomOrderDetailsService>();
            // ...
        }
    }
}

using BlazorServer.Models;

namespace BlazorWasm.Client.Models.ViewModels
{
    public class HotelRoomBookingVM
    {
        public RoomOrderDetailsDTO OrderDetails { get; set; }
    }
}

@page "/hotel/room-details/{Id:int}"

@inject IJSRuntime JsRuntime
@inject ILocalStorageService LocalStorage
@inject IClientHotelRoomService HotelRoomService

@if (HotelBooking?.OrderDetails?.HotelRoomDTO?.HotelRoomImages == null)
{
    <div class="spinner"></div>
}
else
{

}

@code {
    [Parameter]
    public int? Id { get; set; }

    HotelRoomBookingVM HotelBooking  = new HotelRoomBookingVM();
    int NoOfNights = 1;

    protected override async Task OnInitializedAsync()
    {
        try
        {
            HotelBooking.OrderDetails = new RoomOrderDetailsDTO();
            if (Id != null)
            {
                if (await LocalStorage.GetItemAsync<HomeVM>(ConstantKeys.LocalInitialBooking) != null)
                {
                    var roomInitialInfo = await LocalStorage.GetItemAsync<HomeVM>(ConstantKeys.LocalInitialBooking);
                    HotelBooking.OrderDetails.HotelRoomDTO = await HotelRoomService.GetHotelRoomDetailsAsync(
                        Id.Value, roomInitialInfo.StartDate, roomInitialInfo.EndDate);
                    NoOfNights = roomInitialInfo.NoOfNights;
                    HotelBooking.OrderDetails.CheckInDate = roomInitialInfo.StartDate;
                    HotelBooking.OrderDetails.CheckOutDate = roomInitialInfo.EndDate;
                    HotelBooking.OrderDetails.HotelRoomDTO.TotalDays = roomInitialInfo.NoOfNights;
                    HotelBooking.OrderDetails.HotelRoomDTO.TotalAmount =
                        roomInitialInfo.NoOfNights * HotelBooking.OrderDetails.HotelRoomDTO.RegularRate;
                }
                else
                {
                    HotelBooking.OrderDetails.HotelRoomDTO = await HotelRoomService.GetHotelRoomDetailsAsync(
                        Id.Value, DateTime.Now, DateTime.Now.AddDays(1));
                    NoOfNights = 1;
                    HotelBooking.OrderDetails.CheckInDate = DateTime.Now;
                    HotelBooking.OrderDetails.CheckOutDate = DateTime.Now.AddDays(1);
                    HotelBooking.OrderDetails.HotelRoomDTO.TotalDays = 1;
                    HotelBooking.OrderDetails.HotelRoomDTO.TotalAmount =
                        HotelBooking.OrderDetails.HotelRoomDTO.RegularRate;
                }
            }
        }
        catch (Exception e)
        {
            await JsRuntime.ToastrError(e.Message);
        }
    }
}

namespace BlazorWasm.Client.Services
{
    public class ClientHotelRoomService : IClientHotelRoomService
    {
        private readonly HttpClient _httpClient;

        public ClientHotelRoomService(HttpClient httpClient)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
        }

        public Task<HotelRoomDTO> GetHotelRoomDetailsAsync(int roomId, DateTime checkInDate, DateTime checkOutDate)
        {
            // How to url-encode query-string parameters properly
            var uri = new UriBuilderExt(new Uri(_httpClient.BaseAddress, $"/api/hotelroom/{roomId}"))
                            .AddParameter("checkInDate", $"{checkInDate:yyyy'-'MM'-'dd}")
                            .AddParameter("checkOutDate", $"{checkOutDate:yyyy'-'MM'-'dd}")
                            .Uri;
            return _httpClient.GetFromJsonAsync<HotelRoomDTO>(uri);
        }

        public Task<IEnumerable<HotelRoomDTO>> GetHotelRoomsAsync(DateTime checkInDate, DateTime checkOutDate)
        {
           // ...
        }
    }
}

@if (HotelBooking?.OrderDetails?.HotelRoomDTO?.HotelRoomImages == null)
{
    <div class="spinner"></div>
}
else
{
    <div class="mt-4 mx-4 px-0 px-md-5 mx-md-5">
        <div class="row p-2 my-3 " style="border-radius:20px; ">
            <div class="col-12 col-lg-7 p-4" style="border: 1px solid gray">
                <div class="row px-2 text-success border-bottom">
                    <div class="col-8 py-1"><p style="font-size:x-large;margin:0px;">Selected Room</p></div>
                    <div class="col-4 p-0"><a href="hotel/rooms" class="btn btn-secondary btn-block">Back to Room's</a></div>
                </div>
                <div class="row">
                    <div class="col-6">
                        <div id="" class="carousel slide mb-4 m-md-3 m-0 pt-3 pt-md-0" data-ride="carousel">
                            <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
                                <ol class="carousel-indicators">
                                    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
                                    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
                                </ol>
                                <div class="carousel-inner">
                                    <div class="carousel-item active">
                                        <img class="d-block w-100" src="images/slide1.jpg" alt="First slide">
                                    </div>
                                </div>
                                <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
                                    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                                    <span class="sr-only">Previous</span>
                                </a>
                                <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
                                    <span class="carousel-control-next-icon" aria-hidden="true"></span>
                                    <span class="sr-only">Next</span>
                                </a>
                            </div>
                        </div>
                    </div>
                    <div class="col-6">
                        <span class="float-right pt-4">
                            <span class="float-right">Occupancy : @HotelBooking.OrderDetails.HotelRoomDTO.Occupancy adults </span><br />
                            <span class="float-right pt-1">Size : @HotelBooking.OrderDetails.HotelRoomDTO.SqFt sqft</span><br />
                            <h4 class="text-warning font-weight-bold pt-5">
                                <span style="border-bottom:1px solid #ff6a00">
                                    @HotelBooking.OrderDetails.HotelRoomDTO.TotalAmount.ToString("#,#.00#;(#,#.00#)")
                                </span>
                            </h4>
                            <span class="float-right">Cost for @HotelBooking.OrderDetails.HotelRoomDTO.TotalDays nights</span>
                        </span>
                    </div>
                </div>
                <div class="row p-2">
                    <div class="col-12">
                        <p class="card-title text-warning" style="font-size:xx-large">@HotelBooking.OrderDetails.HotelRoomDTO.Name</p>
                        <p class="card-text" style="font-size:large">
                            @((MarkupString)@HotelBooking.OrderDetails.HotelRoomDTO.Details)
                        </p>
                    </div>

                </div>
            </div>
}

@if (HotelBooking?.OrderDetails?.HotelRoomDTO?.HotelRoomImages == null)
{
    <div class="spinner"></div>
}
else
{
  // ...
             
            <div class="col-12 col-lg-5 p-4 2 mt-4 mt-md-0" style="border: 1px solid gray;">
                <EditForm Model="HotelBooking" class="container" OnValidSubmit="HandleCheckout">
                    <div class="row px-2 text-success border-bottom"><div class="col-7 py-1"><p style="font-size:x-large;margin:0px;">Enter Details</p></div></div>

                    <div class="form-group pt-2">
                        <label class="text-warning">Name</label>
                        <InputText @bind-Value="HotelBooking.OrderDetails.Name" type="text" class="form-control" />
                    </div>
                    <div class="form-group pt-2">
                        <label class="text-warning">Phone</label>
                        <InputText @bind-Value="HotelBooking.OrderDetails.Phone" type="text" class="form-control" />
                    </div>
                    <div class="form-group">
                        <label class="text-warning">Email</label>
                        <InputText @bind-Value="HotelBooking.OrderDetails.Email" type="text" class="form-control" />
                    </div>
                    <div class="form-group">
                        <label class="text-warning">Check in Date</label>
                        <InputDate @bind-Value="HotelBooking.OrderDetails.CheckInDate" type="date" disabled class="form-control" />
                    </div>
                    <div class="form-group">
                        <label class="text-warning">Check Out Date</label>
                        <InputDate @bind-Value="HotelBooking.OrderDetails.CheckOutDate" type="date" disabled class="form-control" />
                    </div>
                    <div class="form-group">
                        <label class="text-warning">No. of nights</label>
                        <select class="form-control" value="@NoOfNights" @onchange="HandleNoOfNightsChange">
                            @for (var i = 1; i <= 10; i++)
                            {
                                if (i == NoOfNights)
                                {
                                    <option value="@i" selected="selected">@i</option>
                                }
                                else
                                {
                                    <option value="@i">@i</option>
                                }
                            }
                        </select>
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-success form-control">Checkout Now</button>
                    </div>
                </EditForm>
            </div>
        </div>
    </div>
}

@code {
    // ...

    private async Task HandleNoOfNightsChange(ChangeEventArgs e)
    {
        NoOfNights = Convert.ToInt32(e.Value.ToString());
        HotelBooking.OrderDetails.HotelRoomDTO = await HotelRoomService.GetHotelRoomDetailsAsync(
            Id.Value,
            HotelBooking.OrderDetails.CheckInDate,
            HotelBooking.OrderDetails.CheckInDate.AddDays(NoOfNights));

        HotelBooking.OrderDetails.CheckOutDate = HotelBooking.OrderDetails.CheckInDate.AddDays(NoOfNights);
        HotelBooking.OrderDetails.HotelRoomDTO.TotalDays = NoOfNights;
        HotelBooking.OrderDetails.HotelRoomDTO.TotalAmount =
                NoOfNights * HotelBooking.OrderDetails.HotelRoomDTO.RegularRate;
    }

    private async Task HandleCheckout()
    {
        if (!await HandleValidation())
        {
            return;
        }
    }

    private async Task<bool> HandleValidation()
    {
        if (string.IsNullOrEmpty(HotelBooking.OrderDetails.Name))
        {
            await JsRuntime.ToastrError("Name cannot be empty");
            return false;
        }

        if (string.IsNullOrEmpty(HotelBooking.OrderDetails.Phone))
        {
            await JsRuntime.ToastrError("Phone cannot be empty");
            return false;
        }

        if (string.IsNullOrEmpty(HotelBooking.OrderDetails.Email))
        {
            await JsRuntime.ToastrError("Email cannot be empty");
            return false;
        }
        return true;
    }
}