How to include HttpHandler for .ashx extension in web.config?

Hi sir,
Tell me the code to include HttpHandler for .ashx extension in web.config. Kindly give me
the solution for this problem. I attached the code for the reference.

Web.config:
***********************
<system.web>
<httpHandlers>
<!--<add verb="*" path="ShowImage.ashx" type="ShowImage,System.Web.UI.SimpleHandlerFactory" validate="true" />-->
<!--<add verb="*" path="ShowImage.ashx" type="Web.Framework.HttpHandlers.SomeHandler, Web.Framework, Version=4.0, Culture=neutral" />-->
<add path="*" verb="*" type="System.Web.UI.SimpleHandlerFactory" validate="true" />
</httpHandlers>

</system.web>

Design Page:
****************
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="S.No.">
<ItemTemplate>
<%#((GridViewRow)Container).DataItemIndex+1 %>

</ItemTemplate>

</asp:TemplateField>
<asp:TemplateField HeaderText="Image">
<ItemTemplate>
<asp:Image ID="Image1" runat="server"
ImageUrl='<%# "ShowImage.ashx?ID=" + Eval("uhid")%>'/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>


C# code for .ashx:
**************************

<%@ WebHandler Language="C#" Class="ShowImage" %>

using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;


public class ShowImage : IHttpHandler {

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
context.Response.Write("Hello World");

if (context.Request.QueryString["ID"] != null)
{
SqlCommand cmd;
// context.Response.Write(context.Request.QueryString["id"]);
string dbcon = ConfigurationManager.ConnectionStrings["con"].ConnectionString;
SqlConnection con = new SqlConnection(dbcon);
con.Open();

cmd = new SqlCommand("SELECT picture FROM photos WHERE uhid =@autoId", con);

cmd.Parameters.AddWithValue("@autoId", context.Request.QueryString["ID"].ToString());
SqlDataReader dr = cmd.ExecuteReader();

while (dr.Read())
{
//context.Response.ContentType = "image/JPEG";
context.Response.BinaryWrite((byte[])dr["picture"]);
}
dr.Close();
con.Close();
}
else
{
context.Response.Write("No Image Found");
}
}

public bool IsReusable {
get {
return true;
}
}

}

With regards,
J.Prabu.
[Email:prbspark@gmail.com]