Today, In this article I will tell you about Create Web API with ASP.NET 5, run outside IIS application. First step, open visual studio and then make a console application as you can see on the picture below:

Create the Web API & OWIN Packages
Go to Tools menu, choose Library Package Manager, then select Package Manager Console. In the Package Manager Console window, enter the following code:
Install-Package Microsoft.AspNet.WebApi.OwinSelfHost

Then, right click the project. Create new class named Startup.cs and add the following code:
public class Startup
   {
        // This code configures Web API. The Startup class is specified as a type
        // parameter in the WebApp.Start method.
        public void Configuration(IAppBuilder appBuilder)
        {
            // Configure Web API for self-host.
           HttpConfiguration config = new HttpConfiguration();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
             appBuilder.UseWebApi(config);
        }
    }

Now create a Web API controller class. In Solution Explorer, right click the project & choose Add / Class to add a new class. I named it: HelloController. Then write the following code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Http;
namespace SelfHostWebApi
{
    public class HelloController : ApiController
    {
        // GET api/values/5
        public string Get(int id)
        {
            return "Hello API";
        }
    }
}

Open Program.cs and add write the code below, inside main method:
using Microsoft.Owin.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
namespace SelfHostWebApi
{
    class Program
    {
        static void Main(string[] args)
        {
            string baseAddress = "http://localhost:9000/";
            // Start OWIN host
            using (WebApp.Start<Startup>(url: baseAddress))
            {
                // Create HttpCient and make a request to api/values
                HttpClient client = new HttpClient();
                var response = client.GetAsync(baseAddress + "api/hello").Result;
                Console.WriteLine(response);                
                Console.WriteLine(response.Content.ReadAsStringAsync().Result);
            }
            Console.ReadLine();
        }    }
}

Finally, your self hosted Web API is ready. You will see the output like the picture below when you Run it.

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