.NET alpha blend appears as solid colour

Question

I created a form that overlays on top of another form in an alpha blended state. This works great on my laptop but I just transferred the program to a computer at work and the form is a solid colour. This is probably a completely obvious question but are there graphics card requirements or colour depth requirements for alpha blending, I had a look and it looks like the colour depth is already 32 bit. My laptop is running windows vista and the work computers are xp incase that makes a difference.

Edit: Sorry should have put this is a winforms project

Answer 1

It's very unlikely this has anything to do with the graphics card/controller, since this is not something too heavy on computational power. It's more likely this has to do with the browser compatibility with alpha blending.

The answer could lie in that you have different browsers on your laptop and work computer.

Answer 2

Taking a guess that your application is a WPF one...

Alpha blending of WPF applications is not supported on XP.

Answer 3

I found the problem alpha blending was working for the standard controls however there was a direct show component on the form which doesn't play nice with transparency in XP but does in Vista.