Images are not displayed properly by using http handler

<%@ 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 itemid;
        if (context.Request.QueryString["id"] != null)
            itemid = Convert.ToInt32(context.Request.QueryString["id"]);
        else
            throw new ArgumentException("No parameter specified");

        context.Response.ContentType = "image/jpeg";
        Stream strm = ShowEmpImage(itemid);
        if (strm == null)
        {
            return;
        }
        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 itemid)
    {
        string conn = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        SqlConnection connection = new SqlConnection(conn);
        string sql = "SELECT item_image FROM TbItem WHERE item_id = @ID";
        SqlCommand cmd = new SqlCommand(sql, connection);
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@ID", itemid);
        connection.Open();
        object img = cmd.ExecuteScalar();
        try
        {
            return new MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}

BinaryReader rr;
   //Int32 a;
   byte[] a;
   protected void Button4_Click(object sender, EventArgs e)
   {
       try
       {
           if (FileUpload1.HasFile)
           {
               rr = new BinaryReader(FileUpload1.PostedFile.InputStream);
               a = rr.ReadBytes(FileUpload1.PostedFile.ContentLength);
               string path = FileUpload1.FileName;
               FileUpload1.PostedFile.SaveAs(Server.MapPath("../Admin/Images/" + path));
               //HttpPostedFile image = FileUpload1.PostedFile;
               Image1.ImageUrl = "../Admin/Images/" + path;
               Session["a"] = a;
               // byte[] arr = rr.ReadBytes(FileUpload1.PostedFile.ContentLength);
           }
           else
           {
               Label6.Text = "please Select Image by Borrowsing";
           }
       }
       catch (Exception ex)
       {

        }
    }