I have been using System.Drawing.Bitmap class for some time now. If you use that on a site such as:

Dim loImage As System.Drawing.Bitmap
loImage = New System.Drawing.Bitmap(oProcess.oApp.cHttpFat + lcImage + ".jpg")

Don't forget to do this:

loImage.Dispose()

As the image would remained locked in IIS. So, basically, if you wish to update a store item, for example, this will not be possible if a previous hit made access to that code and that the Dispose() event wouldn't be called.

Sometimes, I forget about that one. So, I thought I would add it here.