error in retrieve picture in web via ASP.NET

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        SqlConnection connection = null;
        try
        {
            FileUpload img = (FileUpload)imgUpload;
            Byte[] imgByte = null;
            if (img.HasFile && img.PostedFile != null)
            {
                //To create a PostedFile
                HttpPostedFile File = imgUpload.PostedFile;
                //Create byte Array with file len
                imgByte = new Byte[File.ContentLength];
                //force the control to load data in array
                File.InputStream.Read(imgByte, 0, File.ContentLength);
            }
            // Insert the employee name and image into db
            string conn = ConfigurationManager.ConnectionStrings["Data Source=.;Initial Catalog=Employee;Integrated Security=True"].ConnectionString;
            connection = new SqlConnection(conn);

            connection.Open();
            string sql = "INSERT INTO EmpDetails(empname,empimg) VALUES(@enm, @eimg) SELECT @@IDENTITY";
            SqlCommand cmd = new SqlCommand(sql, connection);
            cmd.Parameters.AddWithValue("@enm", txtEName.Text.Trim());
            cmd.Parameters.AddWithValue("@eimg", imgByte);
            int id = Convert.ToInt32(cmd.ExecuteScalar());
            lblResult.Text = String.Format("Employee ID is {0}", id);
            Image1.ImageUrl = "~/Handler.ashx?id=" + id;
        }
        catch
        {
            lblResult.Text = "There was an error";
        }
        finally
        {
            connection.Close();
        }
        
    }

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

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

public class Handler : 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);
       }        
       //context.Response.BinaryWrite(buffer);
    }
 
    public Stream ShowEmpImage(int empno)
    {
 string conn = ConfigurationManager.ConnectionStrings     ["EmployeeConnString"].ConnectionString;
        SqlConnection connection = new SqlConnection(conn);
        string sql = "SELECT empimg FROM EmpDetails 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;
        }
    }
 
 
}