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In this article I will explain in detail latest 5 preview era started with first preview release ASP.NET 1.0 around 15 years ago, millions of developers have used it to build and run web applications, and over the years Microsoft added great features in


ASP.NET 5 is a significant change of ASP.NET, in this article I will introduce you 5 purviews.
ASP.NET 5 is a new open-source and cross-platform framework for building modern cloud-based Web apps. using .NET.
You can develop and run your ASP.NET 5 applications cross-platform on Windows, Mac and Linux. open source code is available in GitHub.


Some new features with 5:

1.  New light-weight and modular HTTP request pipeline

2.  Ability to host on IIS or self-host in your own process

3.  Built on .NET Core, which supports true side-by-side app versioning

4.  Ships entirely as NuGet packages

5.  Integrated support for creating and using NuGet packages

6.  Single aligned web stack for Web UI and Web APIs

7.  Cloud-ready environment-based configuration

8.  Built-in support for dependency injection

9.  New tooling that simplifies modern web development

10. Build and run cross-platform ASP.NET apps on Windows, Mac and Linux

12. Open source and community focused


.NET Execution Environment (DNX):

ASP.NET 5/DNX is a lean .NET stack for building modern cloud and web apps that run on OS X, Linux, and Windows.
Microsoft team making number of changes of architectural changes that makes the core web framework much leaner (it no longer requires System.Web.dll).
SP.NET 5 applications are built and run using the new .NET Execution Environment (DNX). Every ASP.NET 5 project is a DNX project.

Every 5 applications defined using a public start-up class:

Sample example:

       public class Startup
public void ConfigureServices(IServiceCollection myservices)
public void Configure(IApplicationBuilder myapp)


ConfigureServices: Method used to define services used by your application.

Configure: Method used to define what middleware makes up your request pipeline.


Service is a component available through dependency injection. Services in ASP.NET 5 come in three varieties: singleton, scoped and transient. Transient services are created each time they’re requested from the container. Scoped services are created only if they don’t already exist in the current scope. For Web applications, a container scope is created for each request, so you can think of scoped services as per request. Singleton services are only ever created once.  


ASP.NET 5 includes server support for running on IIS or self-hosting in your own process. You can use cross platform servers also to host your ASP.NET 5 web application.

Web Root:

The Web root of an ASP.NET 5 application is configured using the “webroot” property in your project.json file.

Client-side development: 5 supports or you can integrate seamlessly with a variety of client-side frameworks like Bootstrap,AngularJS,KnouckoutJS.

Configuration: 5 new configuration model is not based on System.Configuration or Web.config. This new configuration model pulls from an ordered set of configuration providers. The built-in configuration providers support a variety of file formats (XML, JSON, INI) and also environment variables to enable environment-based configuration. You can also write your own custom configuration providers. 


Dictionary Initializer

Dictionary Initializer or Index Initializers:

Developer feels with C# 5.0 or previously syntax for instantiating dictionaries is complex and confusing.

With C# 6.0 the syntax for creating dictionaries is now more simple and clear. It makes the code easier to read.

C# 5.0 (VS 2012)

  Dictionary<string,string> StudentNames = new Dictionary<string, string>()
    { "Nagnath Kendre", "Engineering" },
    { "Sharad Sangle", "arts" },
    { "Girish Sarode", "Commerce" }

C# 6.0 (VS 2015)

    ["Nagnath Kendre"] = "Engineering",
    ["Sharad Sangle"]= "arts" ,
    ["Girish Sarode"] = "Commerce"




In C# 5.0 we can use try, catch and finally blocks together but was unable to use async and await with catch {} and finally {} blocks due to implementation specific issues in the C# compiler. 

This is nice feature provided by C# 6.0, you can do some task without blocking current thread.

Requirement is that create some console application as background process that runs every day and updates data, we require to maintain logs and create notification for exception or failure in that case this new feature is use full.

Example(only exception code in sample example):

      catch (SqlException ex)
                const string errormsg = "Sql exception encountered.";
                await Task.Delay(3000); //waits for 3 seconds
                logger.WriteError(errormsg, ex);
                SendErrorEmail(errormsg, ErrorEmailSubject);
            catch (NullReferenceException ex)
               const string errormsg = "Null reference exception encountered.";
                logger.WriteError(errormsg, ex);
                SendErrorEmail(errormsg, ErrorEmailSubject);
            catch (ArgumentNullException ex)
                const string errormsg = “Argument null reference exception encountered.";
                await Task.Delay(2000); //waits for 2 seconds
                logger.WriteError(errormsg, ex);
                SendErrorEmail(errormsg, ErrorEmailSubject);
                //here release all resources

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