I've moved your post to its own thread, since the thread you posted in was not only 3 years old, but also about a specific bug in a specific old version of WoW.
However, I think you may just be posting on the wrong site, period. This forum is about programming UI addons for World of Warcraft. While the WoW UI does provide an API for displaying images (with some limited manipulation) in the game, your post seems to be about actually resizing image files (not just changing what size images are displayed on-screen) using C# and/or the .NET framework (the WoW UI is written in Lua). You should probably actually read the posts Google brings you to before replying...
However, I think you may just be posting on the wrong site, period. This forum is about programming UI addons for World of Warcraft. While the WoW UI does provide an API for displaying images (with some limited manipulation) in the game, your post seems to be about actually resizing image files (not just changing what size images are displayed on-screen) using C# and/or the .NET framework (the WoW UI is written in Lua). You should probably actually read the posts Google brings you to before replying...