<%@ WebHandler Language="C#" Class="ShowImage" %>

using System;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public class ShowImage : IHttpHandler 
{
    SqlConnection con;
    public void ProcessRequest (HttpContext context) 
    {
        //context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");
        ////context.Response.ContentType = "text/plain";
        // //context.Response.Write("Hello World");
        //Int32 empno;
        string empno;
        if (context.Request.QueryString["roll_number"] != null)
            //empno = Convert.ToInt32(context.Request.QueryString["id"]);
            empno = Convert.ToString(context.Request.QueryString["roll_number"]);
        else
            throw new ArgumentException("No parameter specified");

        context.Response.ContentType = "image/jpeg";
        Stream strm = ShowEmpImage(empno);
        if (strm == null)
        {
        }
        else
        {
            byte[] buffer = new byte[4096];
            int byteSeq = strm.Read(buffer, 0, 4096);

            while (byteSeq > 0)
            {
                context.Response.OutputStream.Write(buffer, 0, byteSeq);
                byteSeq = strm.Read(buffer, 0, 4096);
            }
        }
        //context.Response.BinaryWrite(buffer);
    }

    public Stream ShowEmpImage(string empno)
    {
        con = new SqlConnection(ConfigurationManager.ConnectionStrings["regis_dbConnectionString"].ConnectionString);
   
        //string conn = ConfigurationManager.ConnectionStrings["EmployeeConnString"].ConnectionString;
        //SqlConnection connection = new SqlConnection(conn);
        //string sql = "SELECT empimg FROM EmpDetails WHERE empid = @ID";
        string sql = "SELECT image_data FROM image_master WHERE roll_number = @ID";
        //SqlCommand cmd = new SqlCommand(sql, connection);
        SqlCommand cmd = new SqlCommand(sql, con);
        cmd.CommandType = CommandType.Text;
        //cmd.Parameters.AddWithValue("@ID", empno);
        cmd.Parameters.AddWithValue("@ID", empno);
        //connection.Open();
        con.Open();
        object img = cmd.ExecuteScalar();
        try
        {
            return new MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
        {
            //connection.Close();
            con.Close();
        }
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}