In C#, are there any built-in exceptions I shouldn't use?

Question

Are there any Exceptions defined in the .NET Framework that I shouldn\'t throw in my own code, or that it is bad practice to? Should I write my own?

Answer 1

@Michael There is actually one situation in which it is recommended to throw a NullReferenceException: If the first parameter (the "this" parameter) of an extension method is null. You need to do this in order that null variables behave as expected.