overwrite files (image) and delete image in c#?

Question

I have a simple form which the users can use to upload images. It has a preview button so when User selects an image and clicks on preview, a postback occurs and I save the imag

Answer 1

The exception talks for itself : Your file is still being used/opened by another process, i.e. thread, that you have launched. I bet it is the process by which you open the image file for reading. Make sure you have closed the relevant stream, ten bucks that it will solve your issue.