http handler example using asp.net

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All the request of asp.net is managed by a specialized component known as an HTTP handler. Now as a web developer ,we might want to have some of our own feature plugged in. we want to handle some knew kind of requests or perhaps we want to handle an existing request ourselves to have more control on the generated response.

Example : we may want to decide how to request for .jpg or .gif files will be handles. we need HTTPHandler to have our feature in place..

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For more details about handler you can take reference of MSDN.

References | https://msdn.microsoft.com/en-us/library/ms228090.aspx

Go for  Client side Multiple parameter post :

• Client side ajax post using multiple parameter

Purpose

A handler is responsible for fulfilling requests from a browser. Requests that a browser manages are either handled by file extension or by calling the handler directly.

To create your first table below, complete the following steps:

Step 1 . 

create database Test

create table employee

(

Id int identity,

name nvarchar(100)

)

insert into Employee 

values ('vikas')

insert into Employee 

values ('mohan')

insert into Employee 

values ('ramesh')

insert into Employee 

values ('rahul')

insert into Employee 

values ('rakesh')

Step 2 :

To create your own HTTP handler, complete the following steps

randomqueryfromsql.ashx

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

using System.Web.Script.Serialization;

namespace HttpHandler

{

    ///

    /// Summary description for randomqueryfromsql

    ///

    public class randomqueryfromsql : IHttpHandler

    {

        public void ProcessRequest(HttpContext context)

        {

           int employeeId = 0;

            int.TryParse(context.Request.QueryString["employeeId"], out employeeId);

            string json = this.GetEmployeeJSON(employeeId);

            context.Response.ContentType = "text/json";

            context.Response.Write(json);

        }

        private string GetEmployeeJSON(int EmployeeId)

        {

            List

            using (SqlConnection conn = new SqlConnection())

            {

                conn.ConnectionString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

                using (SqlCommand cmd = new SqlCommand())

                {

                    cmd.CommandText = "SELECT * FROM employee WHERE Id = @Id OR @Id= 0";

                    cmd.Parameters.AddWithValue("@Id", EmployeeId);

                    cmd.Connection = conn;

                    conn.Open();

                    using (SqlDataReader sdr = cmd.ExecuteReader())

                    {

                        while (sdr.Read())

                        {

                            employee.Add(new

                            {

                                CustomerId = sdr["id"],

                                Name = sdr["Name"]

                               

                            });

                        }

                    }

                    conn.Close();

                }

                return (new JavaScriptSerializer().Serialize(employee));

            }

        }

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

}

Step 3:

add below code in web.config for connection.

 

   

 

 


Step 4 : finally out put will display in below window.

Conclusion : we can use http handler for lots of work,where we want to eliminate the Page life cycle.
if we not use page lifecycle, then using http handler we can provide more performance of application.