HttpHandler for Images

<%@ WebHandler Language="VB" Class="dataImgHandler" %>

Imports System
Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.IO
Imports System.data

Public Class dataImgHandler : Implements IHttpHandler
       
    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Try
            Dim myImage As Image = GetBitmap(context)
            context.Response.ContentType = "image/jpeg"
            myImage.Save(context.Response.OutputStream, ImageFormat.Jpeg)
        Catch
            'If the image field in the database is null, it throws exception
            'So, pass the path to the transparent.gif image
            
            Try
                Dim req As HttpRequest = context.Request
                Dim path As String = req.PhysicalPath
                If ((Not (req.UrlReferrer) Is Nothing) AndAlso (req.UrlReferrer.Host.Length > 0)) Then
                    'load a transparent gif 
                    path = context.Server.MapPath("~/images/transparent.gif")
                End If
                Dim contentType As String = Nothing
                contentType = "image/gif"
                context.Response.StatusCode = 200
                context.Response.ContentType = contentType
                context.Response.WriteFile(path)
            Catch
            
            End Try
            
        End Try
    End Sub
    
    Private Function GetBitmap(ByVal context As HttpContext) As Bitmap
        Dim oBitmap As Bitmap = Nothing

        'pass the database guid to get the image row
        Dim guid As String = System.Web.HttpContext.Current.Request.QueryString  ("guid")
        
        'get the byte data from the image field
        Dim myByteImg = 'get data from database here - select imgField1 from mytable where guid = guid
        
         Dim bytPhotoData() As Byte = myByteImg 
         Dim stmPhotoData As New MemoryStream(bytPhotoData)
          
         oBitmap = Image.FromStream(stmPhotoData)
         Return oBitmap  
              
    End Function

    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return True
        End Get
    End Property

End Class

        Image1.ImageUrl = "dataImgHandler.ashx?guid=" & guid