Here’s a summary of what’s new in this preview release:

• Support for route handler filters in minimal APIs
• Improved unit testability for minimal route handlers
• Bind using TryParse in MVC and API controllers
• New Results.Stream() overloads
• Improved HTTP/2 performance when using many streams on a connection
• New ServerReady event for measuring startup time
• Developer exception page dark mode 

Today is a pretty exciting day if you’re an enterprise developer. . . Red Hat and Microsoft have  announced  that the two companies will be working together to bring a supported version of the  .NET r untime to Red Hat’s Enterprise Linux and OpenShift 3

Recently, Carl Frankin, software developer, musician and presenter on the popular programming podcast DotNet Rocks, released a music album aimed a software developers. The album is called Music to Code By and comprises of 3 x 25 minute long music tracks. 

• Custom Elements
• Shadow DOM
• HTML Templates

Custom Elements

//app.component.js
class AppComponent extends HTMLElement {
  static is = 'app-root'
  connectedCallback(){
    this.innerHTML=`<h1>Hello World!</h1>`
  }
}

customElements.define(AppComponent.is, AppComponent)

//index.html
<app-root></app-root>

//confirm-link.component.js
class ConfirmLinkComponent extends HTMLAnchorElement {
  static is = "confim-link";
  connectedCallback() {
    this.addEventListener("click", e => {
      if (!confirm("Are you sure?")) {
        e.preventDefault();
      }
    });
  }
}
customElements.define(ConfirmLinkComponent.is, ConfirmLinkComponent, {
  extends: "a"
});

<a href="http://google.com" is='confirm-link'>
google.com
</a>

var div = document.createElement('div');
var shadowRoot = div.attachShadow({mode: 'open'}); //or mode: 'closed'
shadowRoot.innerHTML = '<h1>Hello Shadow DOM</h1>';

<div id="template" hidden>
  <img src="logo.png">
  <div class="comment"></div>
</div>

<script id="template" type="text/x-template">
  <img src="logo.png">
  <div class="comment"></div>
</script>

<script id="template" type="text/x-kendo-template">
        <ul>
            # for (var i = 0; i < data.length; i++) { #
            <li>#= data[i] #</li>
            # } #
        </ul>
</script>

<template id="template">
  <img src="logo.png">
  <div class="comment"></div>
</template>

  var template = document.querySelector("template");
  var clonedNode = template.content.cloneNode(true); //deep:true
  document.body.appendChild(clonedNode);

System.Diagnostics.StackTrace myTrack = new System.Diagnostics.StackTrace();

static void Main(string[] args)
{
    Console.WriteLine("Stack Trace: {0}", Environment.StackTrace);
}

Stack Trace:at System.Environment.get_StackTrace()
 at DiffThrowAndThrowException.Program.Main(String[] args) in Program.cs:line 9

static void Main(string[] args)
{
  try
  {
     throw new Exception();
  }
  catch (Exception ex)
  {
     Console.WriteLine("Stack Trace: {0}", Environment.StackTrace);
  }
}

Stack Trace:at System.Environment.get_StackTrace()
 at DiffThrowAndThrowException.Program.Main(String[] args) in Program.cs:line 11

    class Program
    {
        static void Main(string[] args)
        {
            FirstExceptionMethod firstException = new FirstExceptionMethod();
            try
            {
                firstException.Method1();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.StackTrace);
            }
        }
    }
    class FirstExceptionMethod
    {
        public void Method1()
        {
            try
            {
                SecondExceptionMethod secondException = new SecondExceptionMethod();
                secondException.Method2();
            }
            catch (Exception ex)
            {
                throw;
            }
        }
    }
    class SecondExceptionMethod
    {
        public void Method2()
        {
            try
            {
                ThrowExMethod();

            }
            catch (Exception ex)
            {
                throw;
            }
        }
        public void ThrowExMethod()
        {
            throw new Exception();
        }
    }  

at DiffThrowAndThrowException.SecondExceptionMethod.ThrowExMethod() in Program.cs:line 51
   at DiffThrowAndThrowException.SecondExceptionMethod.Method2() in Program.cs:line 41
   at DiffThrowAndThrowException.FirstExceptionMethod.Method1() in Program.cs:line 27
   at DiffThrowAndThrowException.Program.Main(String[] args) in Program.cs:line 12  

public void Method1()
        {
            try
            {
                SecondExceptionMethod secondException = new SecondExceptionMethod();
                secondException.Method2();
            }
            catch (Exception ex)
            {
                throw new Exception("Some Text ...");
            }
        }

   at DiffThrowAndThrowException.FirstExceptionMethod.Method1() in Program.cs:line 31
   at DiffThrowAndThrowException.Program.Main(String[] args) in Program.cs:line 12

Server Error in '/' Application.
Page not found: /test/index
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Page not found: /test/index