image upload/retrieve problem urgent...

Question

hi..
i want correct coding ..
pls tell me how to correct this error part
send me soon
coding...
ShowImage.ashx
---------------------------------------
using System;
using System.Configuration;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
 
public class ShowImage : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
Int32 empno;
if (context.Request.QueryString["id"] != null)
empno = Convert.ToInt32(context.Request.QueryString["id"]);
else
throw new ArgumentException("No parameter specified");
context.Response.ContentType = "image/jpeg";
Stream strm = ShowEmpImage(empno);
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);
}
}
public Stream ShowEmpImage(int empno)
{
string conn = ConfigurationManager.ConnectionStrings["Connection"].ConnectionString;
SqlConnection connection = new SqlConnection(conn);
string sql = "SELECT empimg FROM empdetails1 WHERE empid = @ID";
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("@ID", empno);
connection.Open();
object img = cmd.ExecuteScalar();
try
{
return new MemoryStream((byte[])img);
}
catch
{
return null;
}
finally
{
connection.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}

}
----------------------------------
Error:
context.Response.ContentType = "image/jpeg";

No parameter specified