PM> Install-Package Microsoft.AspNetCore.ResponseCompression

{
    "dependencies": {
        "Microsoft.AspNetCore.ResponseCompression": "1.0.0"
    }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddResponseCompression(options =>
    {
        options.MimeTypes = Microsoft.AspNetCore.ResponseCompression.ResponseCompressionDefaults.MimeTypes;
    });
}

namespace Microsoft.AspNetCore.ResponseCompression
{
    /// <summary>
    /// Defaults for the ResponseCompressionMiddleware
    /// </summary>
    public class ResponseCompressionDefaults
    {
        /// <summary>
        /// Default MIME types to compress responses for.
        /// </summary>
        // This list is not intended to be exhaustive, it's a baseline for the 90% case.
        public static readonly IEnumerable<string> MimeTypes = new[]
        {
            // General
            "text/plain",
            // Static files
            "text/css",
            "application/javascript",
            // MVC
            "text/html",
            "application/xml",
            "text/xml",
            "application/json",
            "text/json",
        };
    }
}

services.AddResponseCompression(options =>
{
    options.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(new[]
                                {
                                    "image/svg+xml",
                                    "application/font-woff2"
                                });
            });

services.AddResponseCompression(options =>
{
  //If no compression providers are specified then GZip is used by default.
  //options.Providers.Add<GzipCompressionProvider>();

services.Configure<GzipCompressionProviderOptions>(options =>
{
  options.Level = System.IO.Compression.CompressionLevel.Optimal;
});

 options.EnableForHttps = true;

public void Configure(IApplicationBuilder app)
{
   app.UseResponseCompression()  // Adds the response compression to the request pipeline
   .UseStaticFiles(); // Adds the static middleware to the request pipeline  
}

public void Configure(IApplicationBuilder app,
                      IHostingEnvironment env,
                      ILoggerFactory loggerFactory)
{
    app.UseResponseCompression()
       .UseStaticFiles(
           new StaticFileOptions
           {
               OnPrepareResponse =
                   _ => _.Context.Response.Headers[HeaderNames.CacheControl] = 
                        "public,max-age=604800" // A week in seconds
           })
       .UseMvc(routes => routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}"));
}

 PM> Install-Package Microsoft.AspNetCore.Rewrite

public void Configure(IApplicationBuilder app)
{
    app.UseRewriter(new RewriteOptions()
                            .AddRedirectToHttps()
                            .AddRewrite(@"app/(\d+)", "app?id=$1", skipRemainingRules: false) // Rewrite based on a Regular expression
                            //.AddRedirectToHttps(302, 5001) // Redirect to a different port and use HTTPS
                            .AddRedirect("(.*)/$", "$1")  // remove trailing slash, Redirect using a regular expression
                            .AddRedirect(@"^section1/(.*)", "new/$1", (int)HttpStatusCode.Redirect)
                            .AddRedirect(@"^section2/(\\d+)/(.*)", "new/$1/$2", (int)HttpStatusCode.MovedPermanently)
                            .AddRewrite("^feed$", "/?format=rss", skipRemainingRules: false));

 app.UseRewriter(new RewriteOptions()
.AddIISUrlRewrite(env.ContentRootFileProvider, "web.config")
.AddApacheModRewrite(env.ContentRootFileProvider, ".htaccess"));

public class RedirectWwwRule : Microsoft.AspNetCore.Rewrite.IRule
{
    public int StatusCode { get; } = (int)HttpStatusCode.MovedPermanently;
    public bool ExcludeLocalhost { get; set; } = true;
    public void ApplyRule(RewriteContext context)
    {
        var request = context.HttpContext.Request;
        var host = request.Host;
        if (host.Host.StartsWith("www", StringComparison.OrdinalIgnoreCase))
        {
            context.Result = RuleResult.ContinueRules;
            return;
        }
        if (ExcludeLocalhost && string.Equals(host.Host, "localhost", StringComparison.OrdinalIgnoreCase))
        {
            context.Result = RuleResult.ContinueRules;
            return;
        }
        string newPath = request.Scheme + "://www." + host.Value + request.PathBase + request.Path + request.QueryString;
 
        var response = context.HttpContext.Response;
        response.StatusCode = StatusCode;
        response.Headers[HeaderNames.Location] = newPath;
        context.Result = RuleResult.EndResponse; // Do not continue processing the request
    }
}

 app.UseRewriter(new RewriteOptions().Add(new RedirectWwwRule()));

 var options = new RewriteOptions().Add(app.ApplicationServices.GetService<RedirectWwwRule>());

SELECT   facid,
         DATEPART(month, [StartTime]) AS month,
         sum(slots) AS slots
FROM     bookings
WHERE    starttime >= '2012-01-01'
         AND starttime < '2013-01-01'
GROUP BY ROLLUP(facid, DATEPART(month, [StartTime]))
ORDER BY facid, month;

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()
                            //This is new
                            .GroupByWithRollup(
                                item => item.FacId,
                                item => item.Month,
                                (primaryGrouping, secondaryGrouping) => new
                                {
                                    FacId = primaryGrouping.Key,
                                    Month = secondaryGrouping.Key,
                                    TotalSlots = secondaryGrouping.Sum(item => item.TotalSlots)
                                },
                                item => new
                                {
                                    FacId = item.Key,
                                    Month = -1,
                                    TotalSlots = item.SubTotal(subItem => subItem.TotalSlots)
                                },
                                items => new
                                {
                                    FacId = -1,
                                    Month = -1,
                                    TotalSlots = items.GrandTotal(subItem => subItem.TotalSlots)
                                });

var items = context.Bookings
                                    .GroupBy(booking => new { booking.FacId, booking.Facility.Name })
                                    .Select(group => new
                                    {
                                        group.Key.FacId,
                                        group.Key.Name,
                                        TotalHours = group.Sum(booking => booking.Slots) / 2M
                                    })
                                    .OrderBy(result => result.FacId)
                                    .ToList();

var date1 = new DateTime(2012, 09, 01);
var items = context.Bookings
                                    .Where(booking => booking.StartTime >= date1)
                                    .GroupBy(booking => new
                                    {
                                        booking.Member.Surname,
                                        booking.Member.FirstName,
                                        booking.Member.MemId
                                    })
                                    .Select(group => new
                                    {
                                        group.Key.Surname,
                                        group.Key.FirstName,
                                        group.Key.MemId,
                                        StartTime = group.Min(booking => booking.StartTime)
                                    })
                                    .OrderBy(result => result.MemId)
                                    .ToList();

var members = context.Members
                        .OrderBy(member => member.JoinDate)
                        .Select(member => new
                        {
                            Count = context.Members.Count(),
                            member.FirstName,
                            member.Surname
                        })
                        .ToList();

SELECT COUNT(*)
FROM   [Members] AS [m];

SELECT   [m].[FirstName],
         [m].[Surname],
         @__Count_0 AS [Count]
FROM     [Members] AS [m]
ORDER BY [m].[JoinDate];

SELECT   row_number() OVER (ORDER BY joindate) AS row_number,
         firstname,
         surname
FROM     members
ORDER BY joindate;

var members = context.Members
                        .OrderBy(member => member.JoinDate)
                        .Select(member => new
                        {
                            member.FirstName,
                            member.Surname
                        })
                        .ToList()
                        /*
                            SELECT [m].[FirstName], [m].[Surname]
                                FROM [Members] AS [m]
                                ORDER BY [m].[JoinDate]
                        */
                        // Now using LINQ to Objects
                        .Select((member, index) => new
                        {
                            RowNumber = index + 1,
                            member.FirstName,
                            member.Surname
                        })
                        .ToList();

SELECT facid,
       total
FROM   (SELECT   facid,
                 sum(slots) AS total,
                 rank() OVER (ORDER BY sum(slots) DESC) AS rank
        FROM     bookings
        GROUP BY facid) AS ranked
WHERE  rank = 1;

SELECT   mems.firstname,
         mems.surname,
         ((sum(bks.slots) + 10) / 20) * 10 AS hours,
         rank() OVER (ORDER BY ((sum(bks.slots) + 10) / 20) * 10 DESC) AS rank
FROM     bookings AS bks
         INNER JOIN
         members AS mems
         ON bks.memid = mems.memid
GROUP BY mems.firstname,
         mems.surname
ORDER BY rank, mems.surname, mems.firstname;

var itemsQuery = context.Bookings
                                    .GroupBy(booking => new
                                    {
                                        booking.Member.FirstName,
                                        booking.Member.Surname
                                    })
                                    .Select(group => new
                                    {
                                        group.Key.FirstName,
                                        group.Key.Surname,
                                        Hours = (group.Sum(booking => booking.Slots) + 10) / 20 * 10
                                    })
                                    .OrderByDescending(result => result.Hours)
                                        .ThenBy(result => result.Surname)
                                        .ThenBy(result => result.FirstName);
                var rankedItems = itemsQuery.Select(thisItem => new
                {
                    thisItem.FirstName,
                    thisItem.Surname,
                    thisItem.Hours,
                    Rank = itemsQuery.Count(mainItem => mainItem.Hours > thisItem.Hours) + 1
                })
                .ToList();

var facilitiesQuery =
                            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);

                var rankedFacilities = facilitiesQuery.Select(thisItem => new
                {
                    thisItem.Name,
                    thisItem.TotalRevenue,
                    Rank = facilitiesQuery.Count(mainItem => mainItem.TotalRevenue > thisItem.TotalRevenue) + 1
                })
                .Where(result => result.Rank <= 3)
                .OrderBy(result => result.Rank)
                .ToList();

SELECT   name,
         CASE WHEN class = 1 THEN 'high' WHEN class = 2 THEN 'average' ELSE 'low' END AS revenue
FROM     (SELECT   facs.name AS name,
                   ntile(3) OVER (ORDER BY sum(CASE WHEN memid = 0 THEN slots * facs.guestcost ELSE slots * membercost END) DESC) AS class
          FROM     bookings AS bks
                   INNER JOIN
                   facilities AS facs
                   ON bks.facid = facs.facid
          GROUP BY facs.name) AS subq
ORDER BY class, name;

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)
                                })
                                .OrderByDescending(result => result.TotalRevenue)
                                .ToList();

SELECT   [f].[Name],
         SUM(CASE WHEN [b].[MemId] = 0 THEN CAST ([b].[Slots] AS DECIMAL (18, 6)) * [f].[GuestCost] ELSE CAST ([b].[Slots] AS DECIMAL (18, 6)) * [f].[MemberCost] END) AS [TotalRevenue]
FROM     [Bookings] AS [b]
         INNER JOIN
         [Facilities] AS [f]
         ON [b].[FacId] = [f].[FacId]
GROUP BY [f].[Name]
ORDER BY SUM(CASE WHEN [b].[MemId] = 0 THEN CAST ([b].[Slots] AS DECIMAL (18, 6)) * [f].[GuestCost] ELSE CAST ([b].[Slots] AS DECIMAL (18, 6)) * [f].[MemberCost] END) DESC;

var n = 3;
var tiledFacilities = facilities.Select((item, index) =>
                                        new
                                        {
                                            Item = item,
                                            Index = (index / n) + 1
                                        })
                                        .GroupBy(x => x.Index)
                                        .Select(g =>
                                            g.Select(z =>
                                                new
                                                {
                                                    z.Item.Name,
                                                    z.Item.TotalRevenue,
                                                    Tile = g.Key,
                                                    GroupName = g.Key == 1 ? "High" : (g.Key == 2 ? "Average" : "Low")
                                                })
                                                .OrderBy(x => x.GroupName)
                                                    .ThenBy(x => x.Name)
                                        )
                                        .ToList();

var flatTiledFacilities = tiledFacilities.SelectMany(group => group)
                                        .Select(tile => new { tile.Name, Revenue = tile.GroupName })
                                        .ToList();

var facilities =
                            context.Bookings.Select(booking =>
                                new
                                {
                                    booking.Facility.Name,
                                    booking.Facility.InitialOutlay,
                                    booking.Facility.MonthlyMaintenance,
                                    Revenue = booking.MemId == 0 ?
                                            booking.Slots * booking.Facility.GuestCost
                                            : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => new
                                {
                                    b.Name,
                                    b.InitialOutlay,
                                    b.MonthlyMaintenance
                                })
                                .Select(group => new
                                {
                                    group.Key.Name,
                                    RepayTime =
                                        group.Key.InitialOutlay /
                                                ((group.Sum(b => b.Revenue) / 3) - group.Key.MonthlyMaintenance)
                                })
                                .OrderBy(result => result.Name)
                                .ToList();

var startDate = new DateTime(2012, 08, 1);
var endDate = new DateTime(2012, 08, 31);
var period = 14;

var dailyRevenueQuery =
                        context.Bookings
                                .Select(booking =>
                                new
                                {
                                    StartDate = booking.StartTime.Date, // How to group by date (or TruncateTime) in EF-Core
                                    Revenue = booking.MemId == 0 ?
                                                           booking.Slots * booking.Facility.GuestCost
                                                           : booking.Slots * booking.Facility.MemberCost
                                })
                                .GroupBy(b => b.StartDate)
                                .Select(group =>
                                new
                                {
                                    Date = group.Key,
                                    TotalRevenue = group.Sum(b => b.Revenue)
                                });

var movingAvgs =
                        dailyRevenueQuery
                                .Select(dr1 =>
                                new
                                {
                                    dr1.Date,
                                    MovingAvg = dailyRevenueQuery
                                        .Where(dr2 => dr2.Date <= dr1.Date && dr2.Date >= dr1.Date.AddDays(-period))
                                        .Average(dr2 => dr2.TotalRevenue)
                                })
                                .Where(result => result.Date >= startDate && result.Date <= endDate)
                                .OrderBy(result => result.Date)
                                .ToList();

Learn to build web apps using AngularJS 1.x. By the end of the course, you'll be able to use AngularJS to create your own apps. 

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <LangVersion>latest</LangVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="System.Memory" Version="4.4.0-preview1-25305-02" />
  </ItemGroup>
</Project>

    static class NameValidatorUsingString
    {
        public static bool IsValidName(string name)
        {
            if (name.Length < 2)
                return false;

            if (char.IsLetter(name[0]))
                return true;

            return false;
        }
    }

string fullName = "User 1";
string firstName = fullName.Substring(0, 4);
NameValidatorUsingString.IsValidName(firstName);

char[] anotherFullName = { 'A', 'B' };

NameValidatorUsingString.IsValidName(anotherFullName);

NameValidatorUsingString.IsValidName(new string(anotherFullName));

    static class NameValidatorUsingSpan
    {
        public static bool IsValidName(ReadOnlySpan<char> name)
        {
            if (name.Length < 2)
                return false;

            if (char.IsLetter(name[0]))
                return true;

            return false;

        }
    }

ReadOnlySpan<char> fullName = "User 1".AsSpan();
ReadOnlySpan<char> firstName = fullName.Slice(0, 4);
NameValidatorUsingSpan.IsValidName(firstName);

char[] anotherFullName = { 'A', 'B' };
NameValidatorUsingSpan.IsValidName(anotherFullName);

var arr = new byte[10];
Span<byte> bytes = arr; // Implicit cast from T[] to Span<T>

Span<byte> slicedBytes = bytes.Slice(start: 5, length: 2);
slicedBytes[0] = 42;
slicedBytes[1] = 43;
slicedBytes[2] = 44; // Throws IndexOutOfRangeException
bytes[2] = 45; // OK

var array = new byte[100];
Span<byte> interiorRef1 = array.AsSpan().Slice(start: 20);

Span<byte> interiorRef2 = new Span<byte>(array: array, start: 20, length: array.Length - 20);

class Impossible
{
   Span<byte> field;
}

static async Task<int> ChecksumReadAsync(Memory<byte> buffer, Stream stream)
{
   int bytesRead = await stream.ReadAsync(buffer);
   return Checksum(buffer.Span.Slice(0, bytesRead));
   // Or buffer.Slice(0, bytesRead).Span
}

 <add name="ASP.NET v4.0" autoStart="true" managedRuntimeVersion="v4.0" managedPipelineMode="Integrated">
    <processModel identityType="ApplicationPoolIdentity" loadUserProfile="true" setProfileEnvironment="true" />
</add>

 Prefix - Namespace
xml = http://www.w3.org/XML/1998/namespace
xs = http://www.w3.org/2001/XMLSchema
xsi = http://www.w3.org/2001/XMLSchema-instance
fn = http://www.w3.org/2004/07/xpath-functions
sqltypes = http://schemas.microsoft.com/sqlserver/2004/sqltypes
xdt = http://www.w3.org/2004/07/xpath-datatypes
(no prefix) = urn:schemas-microsoft-com:xml-sql
(no prefix) = http://schemas.microsoft.com/sqlserver/2004/SOAP

  <xsd:simpleType name="char">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>
  <xsd:simpleType name="nchar">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>
  <xsd:simpleType name="varchar">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>
  <xsd:simpleType name="nvarchar">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>
  <xsd:simpleType name="text">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>
  <xsd:simpleType name="ntext">
    <xsd:restriction base="xsd:string"/>
  </xsd:simpleType>

  <xsd:simpleType name="datetime">
    <xsd:restriction base="xsd:dateTime">
      <xsd:pattern value="((000[1-9])|(00[1-9][0-9])|(0[1-9][0-9]{2})|([1-9][0-9]{3}))-((0[1-9])|(1[012]))-((0[1-9])|([12][0-9])|(3[01]))T(([01][0-9])|(2[0-3]))(:[0-5][0-9]){2}(\.[0-9]{2}[037])?"/>
      <xsd:maxInclusive value="9999-12-31T23:59:59.997"/>
      <xsd:minInclusive value="1753-01-01T00:00:00.000"/>
    </xsd:restriction>
  </xsd:simpleType>

CREATE XML SCHEMA COLLECTION invcol AS
'<xs:schema ... targetNamespace="urn:invoices">
...
</xs:schema>
'

CREATE TABLE Invoices(
id int IDENTITY PRIMARY KEY,
invoice XML(invcol)
)

CREATE XML SCHEMA COLLECTION geocol AS
'<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="urn:geo"
           elementFormDefault="qualified"
           xmlns:tns="urn:geo">
  <xs:simpleType name="dim">
    <xs:restriction base="xs:int" />
  </xs:simpleType>
  <xs:complexType name="Point">
    <xs:sequence>
      <xs:element name="X" type="tns:dim"  minOccurs="0" maxOccurs="unbounded" />
      <xs:element name="Y" type="tns:dim"  minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>
  <xs:element name="Point" type="tns:Point" />
</xs:schema>'

 declare @geo_tab table(
 id int identity primary key,
 point xml(content geocol)
)
 
insert into @geo_tab values('<Point xmlns="urn:geo"><X>10</X><Y>20</Y></Point>')
insert into @geo_tab values('<Point xmlns="urn:geo"><X>10</X><Y>test</Y></Point>')

 XML Validation: Invalid simple type value: 'test'. Location: /*:Point[1]/*:Y[1]

 select * from sys.xml_schema_collections
select * from sys.xml_schema_namespaces
select * from sys.xml_schema_elements
select * from sys.xml_schema_attributes
select * from sys.xml_schema_types
select * from sys.column_xml_schema_collection_usages
select * from sys.parameter_xml_schema_collection_usages

 declare @x xml
select @x = xml_schema_namespace(N'dbo', N'geocol')
print convert(varchar(max), @x)

 alter XML SCHEMA COLLECTION geocol add @x

 declare @x xml
set @x = (select * from openrowset(bulk 'c:\path\file.xsd', single_blob) as x)
CREATE XML SCHEMA COLLECTION geocol2 AS @x

Today we’re happy to announce the availability of the release candidate (RC) of TypeScript 3.1. Our intent with the RC is to gather any and all feedback so that we can ensure our final release is as pleasant as possible. 

declare @cntr_value bigint

Select @cntr_value=cntr_value
from sys.dm_os_performance_counters
where instance_name='AdventureWorks' and
counter_name='Write Transactions/sec'

/* ایجاد یک تاخیر مثلاً یک ثانیه */
waitfor delay '00:00:01'

Select cntr_value -@cntr_value
from sys.dm_os_performance_counters
where instance_name='AdventureWorks' and
counter_name='Write Transactions/sec'

EXEC sys.sp_MSforeachtable 'sp_spaceused ''?''';

 USE [AdventureWorksDW2008R2]
GO

CREATE TABLE #TableSpaceUsed(
[name] [nvarchar](120) NULL,
[rows] [nvarchar](120) NULL,
[reserved] [nvarchar](120) NULL,
[data] [nvarchar](120) NULL,
[index_size] [nvarchar](120) NULL,
[unused] [nvarchar](120) NULL
) ON [PRIMARY]

Insert Into #TableSpaceUsed
EXEC sys.sp_MSforeachtable 'sp_spaceused ''?''';

Select * from #TableSpaceUsed
Order by CAST([rows] as int) desc

Drop table #TableSpaceUsed