Question: From where can I get image processing libraries in C# .Net?

Answer: 
I know a third-party toolkit named leadtools that provides many image processing functions. Also, it supports hundreds of image formats. You can find more information here:
<http://www.leadtools.com/sdk/image-processing/default.htm>
Beside the framework functions I like [Image\_Processing\_Lab](http://www.codeproject.com/KB/GDI-plus/Image_Processing_Lab.aspx).