http handler not working

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C#

ASP.NET

C#4.0

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

using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;
using System.Drawing.Imaging;

public class Handler : IHttpHandler {

SqlConnection con=new SqlConnection(ConfigurationManager.ConnectionStrings["Drawing1"].ConnectionString) ;
SqlCommand cmd;

public void ProcessRequest (HttpContext context)
{

cmd = new SqlCommand("select Img from Service_Name where Service_Id=1002", con);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
context.Response.ContentType = "image/png";//use ur image type
context.Response.BinaryWrite((byte[])reader["Img"]);
}
con.Close();
}

public bool IsReusable {
get {
return false;
}
}

}


page only contains <asp:Image ID="Image1" Width="200px" Height="200px" runat="server" ImageUrl="~/Handler.ashx"/>

and when i see source after execution the image shows "The image cannot be shown as it contains error"