Is use of string.IsNullOrEmpty(string) when checking a string considered as bad practice when there is string.IsNullOrWhiteSpace(string) in .NET 4.
string.IsNullOrEmpty(string)
string.IsNullOrWhiteSpace(string)
They are different functions. You should decide for your situation what do you need.
I don't consider using any of them as a bad practice. Most of the time IsNullOrEmpty() is enough. But you have the choice :)
IsNullOrEmpty()