Easier Method To Display Images

My instructor gave us example code that is very similiar to the code below. I haven't heard back from him yet and wanted to find out why my code won't work properly. Could someone give me some advice on what I'm doing wrong or an easier method to display images.

<%@ WebHandler Language="VB" Class="images" %>
Imports System
Imports System.Web
Imports System.Data.SqlClient
Public Class images : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim id As String = context.Request.QueryString("ImageId")
Dim userId As Integer = 4
Dim conn As New System.Data.SqlClient.SqlConnection
Dim cmd As New System.Data.SqlClient.SqlCommand
conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
cmd.Connection = conn
cmd.CommandText = "SELECT Image FROM mrg_Image WHERE UserId=@userId"
cmd.Parameters.AddWithValue("@userId", userId)
conn.Open()
Dim file_bytes As Byte() = cmd.ExecuteScalar()
Dim file_bytes_stream As New System.IO.MemoryStream(file_bytes)
'During the build - The next line of code is highlighted green with the error message of, "Parameter is invalid"
Dim the_image As New System.Drawing.Bitmap(file_bytes_stream)
context.Response.ContentType = "image/jpg"
the_image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg)
conn.Close()
End Sub
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
End Class