C# How can I test a file is a jpeg?

Question

Using C# how can I test a file is a jpeg? Should I check for a .jpg extension?

Thanks

Answer 1

The code here:

http://mark.michaelis.net/Blog/RetrievingMetaDataFromJPEGFilesUsingC.aspx

Shows you how to get the Meta Data. I guess that would throw an exception if your image wasn't a valid JPEG.