image retrieve urgent

hi..
Anybody pls help me to recover this error..

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);
SqlConnection connection1 = new SqlConnection("Data Source=RHINO;Initial Catalog=HR;password=hrproject;User ID=HR;");
connection1.Open();

SqlCommand cmd = new SqlCommand();
cmd.Connection = connection1;
cmd.CommandText = "SELECT empimg FROM empdetails1 WHERE empid = '"+ empno+"'";
object img = cmd.ExecuteScalar();
try
{
return new MemoryStream((byte[])img);
}
catch
{
return null;
}
finally
{
connection1.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}

}

output:
images are not to be retrieved to image controls from DB ...