public static class ApmWrapper
    {
        public static Task<int> ReadAsync(this Stream stream, byte[] data, int offset, int count)
        {
            return Task<int>.Factory.FromAsync(stream.BeginRead, stream.EndRead, data, offset, count, null);
        }
    }

using System;
using System.IO;
using System.Threading.Tasks;

namespace Async06
{
    public static class ApmWrapper
    {
        public static Task<int> ReadAsync(this Stream stream, byte[] data, int offset, int count)
        {
            return Task<int>.Factory.FromAsync(stream.BeginRead, stream.EndRead, data, offset, count, null);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            using (var stream = File.OpenRead(@"..\..\program.cs"))
            {
                var data = new byte[10000];
                var task = stream.ReadAsync(data, 0, data.Length);
                Console.WriteLine("Read bytes: {0}", task.Result);
            }
        }
    }
}

using (var stream = File.OpenRead(@"..\..\program.cs"))
{
    var data = new byte[10000];
    var task = stream.ReadAsync(data, 0, data.Length);
    task.ContinueWith(t => Console.WriteLine("Read bytes: {0}", t.Result)).Wait();
}

    public static class WebClientExtensions
    {
        public static Task<string> DownloadTextTaskAsync(this WebClient web, string url)
        {
            var tcs = new TaskCompletionSource<string>();

            DownloadStringCompletedEventHandler handler = null;
            handler = (sender, args) =>
            {
                web.DownloadStringCompleted -= handler;

                if (args.Cancelled)
                {
                    tcs.SetCanceled();
                }
                else if(args.Error!=null)
                {
                    tcs.SetException(args.Error);
                }
                else
                {
                    tcs.SetResult(args.Result);
                }
            };

            web.DownloadStringCompleted += handler;
            web.DownloadStringAsync(new Uri(url));

            return tcs.Task;
        }
    }

[MyAttr(nameof(parameter))]
void Method(string parameter)
{
}

[MyAttr(nameof(T))]
void Method<T>()
{
}

void Method([MyAttr(nameof(parameter))] int parameter)
{
}

[return: NotNullIfNotNull(nameof(path))]
public static string? GetUrl(string? path)
        => !string.IsNullOrEmpty(path) ? $"https://localhost/api/{path}" : null;

 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

{
    "dependencies": {
         //same as before
         "Microsoft.AspNetCore.Mvc.TagHelpers": "1.0.0",
         "Microsoft.AspNetCore.Razor.Runtime": "1.0.0",
         "Microsoft.AspNetCore.Razor.Tools": {
            "version": "1.0.0-preview2-final",
            "type": "build"
        }
    },
 
    "tools": {
         //same as before
        "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final"
    } 
}

 <a asp-controller="Home" asp-action="Index" asp-route-id="123">Home</a>

 <a asp-route="login">Login</a>

 <a asp-controller="Account"
   asp-action="Register"
   asp-protocol="https"
   asp-host="asepecificdomain.com"
   asp-fragment="fragment">Register</a>

 <form asp-controller="Account"
      asp-action="Login"
      asp-route-returnurl="@ViewBag.ReturnUrl"
      method="post" >
</form>

 <form action="/Account/Login?returnurl=%2FHome%2FAbout" method="post">

 <form asp-route="login"
      asp-route-returnurl="@ViewBag.ReturnUrl"
      method="post" >
</form>

 <script asp-src-include="~/app/**/*.js"></script>

 <script src="/app/app.js"></script>
<script src="/app/controllers/controller1.js"></script>
<script src="/app/controllers/controller2.js"></script>
<script src="/app/controllers/controller3.js"></script>
<script src="/app/controllers/controller4.js"></script>
<script src="/app/services/service1.js"></script>
<script src="/app/services/service2.js"></script>

 <script asp-src-include="~/app/**/*.js"
        asp-src-exclude="~/app/services/**/*.js">
</script>

 <link rel="stylesheet" href="//ajax.aspnetcdn.com/ajax/bootstrap/3.0.0/css/bootstrap.min.css"
      asp-fallback-href="~/lib/bootstrap/css/bootstrap.min.css"
      asp-fallback-test-class="hidden"
      asp-fallback-test-property="visibility"
      asp-fallback-test-value="hidden" />
 
<script src="//ajax.aspnetcdn.com/ajax/bootstrap/3.0.0/bootstrap.min.js"
        asp-fallback-src="~/lib/bootstrap/js/bootstrap.min.js"
        asp-fallback-test="window.jQuery">
</script>

 <link rel="stylesheet" href="~/css/site.min.css" asp-file-version="true"/>

 <link rel="stylesheet" href="/css/site.min.css?v=UdxKHVNJA5vb1EsG9O9uURFDfEE3j1E3DgwL6NiDGMc" />

 <img src="~/images/logo.png"
     alt="company logo"
     asp-file-version="true" />

 <img src="/images/logo.png?v=W2F5D366_nQ2fQqUk3URdgWy2ZekXjHzHJaY5yaiOOk"
     alt="company logo"/>

<environment names="Development">    
   <link rel="stylesheet" href="~/css/site1.css" />
   <link rel="stylesheet" href="~/css/site2.css" />
</environment>

<environment names="Staging,Production">
   <link rel="stylesheet" href="~/css/site.min.css" asp-file-version="true"/>
</environment>

public class CustomerViewModel
{
   public string Vehicle { get; set; }  
   public List<SelectListItem> Vehicles { get; set; }

 <select asp-for="Vehicle" asp-items="Model.Vehicles">
</select>

@page "/LearnRouting"

<h3>Learn Routing</h3>

<li class="nav-item px-3">
    <NavLink class="nav-link" href="LearnRouting">
        <span class="oi oi-list-rich" aria-hidden="true"></span> Learn Routing
    </NavLink>
</li>

@page "/LearnRouting"
@page "/NewRouting"

<h3>Learn Routing</h3>

@page "/LearnRouting"
@page "/NewRouting"
@page "/LearnRouting/{parameter1}"
@page "/LearnRouting/{parameter1}/{parameter2}"

<h3>Learn Routing</h3>

<p>Parameter1: @Parameter1</p>
<p>Parameter2: @Parameter2</p>

@code
{
    [Parameter]
    public string Parameter1 { set; get; }

    [Parameter]
    public string Parameter2 { set; get; }
}

@page "/LearnAdvancedRouting"

<h3>Learn Advanced Routing</h3>

<NavLink class="btn btn-secondary" href="LearnAdvancedRouting">
    <span class="oi oi-list-rich" aria-hidden="true"></span> Learn Advanced Routing
</NavLink>

<NavLink class="btn btn-secondary" href="LearnAdvancedRouting?param1=value1&param2=value2">
    <span class="oi oi-list-rich" aria-hidden="true"></span> Learn Advanced Routing
</NavLink>

@page "/LearnAdvancedRouting"
@inject NavigationManager NavigationManager

<h3>Learn Advanced Routing</h3>

<h4>Parameter 1 : @Param1</h4>
<h4>Parameter 2 : @Param2</h4>

@code
{
    string Param1;
    string Param2;

    protected override void OnInitialized()
    {
        base.OnInitialized();

        var absoluteUri = new Uri(NavigationManager.Uri);
        var queryParam = System.Web.HttpUtility.ParseQueryString(absoluteUri.Query);
        Param1 = queryParam["Param1"];
        Param2 = queryParam["Param2"];
    }
}

@page "/LearnAdvancedRouting"
@inject NavigationManager NavigationManager

@*<NavLink href="/learnrouting" class="btn btn-secondary">Back to Routing</NavLink>*@
@*<a href="/learnrouting" class="btn btn-secondary">Back to Routing</a>*@
<button class="btn btn-secondary" @onclick="BackToRouting">Back to Routing</button>

@code
{
    private void BackToRouting()
    {
        NavigationManager.NavigateTo("learnrouting");
    }
}