image handler file error

<%@ WebHandler Language="C#" Class="ShowImage" %>



using System;

using System.Web;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;



public class ShowImage : IHttpHandler {

    

    public void ProcessRequest (HttpContext context) {

        if (context.Request.QueryString["ProductId"] == null) return;

        string ProductId = context.Request.QueryString["ProductId"];

        string connStr = ConfigurationManager.ConnectionStrings["ConnStr"].ToString();

        using (SqlConnection conn = new SqlConnection(connStr))

        {

            using (SqlCommand cmd = new SqlCommand("SELECT Item FROM BookDetails WHERE ProductId = @ProductId", conn))

            {

                cmd.Parameters.Add(new SqlParameter("@ProductId", ProductId));

                conn.Open();

                using (SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection))

                {

                    reader.Read();

                    context.Response.BinaryWrite((Byte[])reader[reader.GetOrdinal("Item")]);

                    reader.Close();

                }

            }

        }

    }

 

    public bool IsReusable {

        get {

            return false;

        }

    }



}