Saturday, 12 October 2013

How to create Web Api in web forms

How to create Web Api in web forms 4.0/4.5

1) Create a ASP.NET Empty WEB Application using .NET 4.0/4.5
2) Add Web Api Controller class

        Name it as ValuesController.cs   VS 2012 adds ValuesController1.cs  remove 1 otherwise it won't work. i.e ApiController controller class must end with "Controller"

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;

namespace WebApplication3
    public class ValuesController : ApiController
        // GET api/<controller>
        public IEnumerable<string> Get()
            return new string[] { "value1", "value2" };

        // GET api/<controller>/5
        public string Get(int id)
            return "value";

        // POST api/<controller>
        public void Post([FromBody]string value)

        // PUT api/<controller>/5
        public void Put(int id, [FromBody]string value)

        // DELETE api/<controller>/5
        public void Delete(int id)

3)  Add Global.asax global class.

  in  Application_Start

add following namespaces( These Assemblies will be referenced automatically whenever u add Web Api Control class)

using System.Web.Http;

using System.Web.Routing;

4) in Application_start Global.asax

      Add Routing information for WEB APIS.

 4.1  "WebApi/{controller}"   in this -->  WebApi is a optional constant. User has his own choice of specifying it or not.

 4.2 {contoller}  is a keyword.(must be specified)
 4.3 "Defaultapi" -> Routing table is dictionary so it must be unique across the web application.
            user has choice of  specify any value here.

Here is the code.

namespace WebApplication3
    public class Global : System.Web.HttpApplication

        protected void Application_Start(object sender, EventArgs e)

Here is the Project files

That's it

Just run the Web Application

Here is the URL to access WebAPI.


1)change port number 
2)WebApi constant specified in Routing tag.

if Routing url is "{controller}" then to access WebAPI through url


Note:  Controller class can be Anywhere in the Web Application. i.e it can be even in nested folders. But Controller name should be unique unless specified by different routing values.

tags: How to create Web Api in Web forms,

Using Web API with ASP.NET Web Forms, Adding Web Api support to Web Forms,

How to access Web Api in web forms 4.0,

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