Display/Store and Retrieve Image Data from Database to Gridview, and also on Mouse Over

<%@ WebHandler Language="C#" Class="ShowPosterImg" %>
using System;
using System.Configuration;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;

public class ShowPosterImg : 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";
        System.IO.Stream strm = ShowEmpImage(empno);
        byte[] buffer = new byte[32768];
        int byteSeq = strm.Read(buffer, 0, 32768);   //4094

        while (byteSeq > 0)
        {
            context.Response.OutputStream.Write(buffer, 0, byteSeq);
            byteSeq = strm.Read(buffer, 0, 32768);
        }  
    }

    private System.IO.Stream ShowEmpImage(int empno)
    {
        string conn = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        System.Data.SqlClient.SqlConnection connection = new System.Data.SqlClient.SqlConnection(conn);
        string sql = "SELECT BytesPoster FROM User WHERE empid = @ID";
        System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, connection);
        cmd.CommandType = System.Data.CommandType.Text;
        cmd.Parameters.AddWithValue("@ID", empno);
        connection.Open();
        object img = cmd.ExecuteScalar();
        try
        {
            return new System.IO.MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
 

}