string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)

Question

Is use of string.IsNullOrEmpty(string) when checking a string considered as bad practice when there is string.IsNullOrWhiteSpace(string) in .NET 4.

Answer 1

In the .Net standard 2.0:

string.IsNullOrEmpty(): Indicates whether the specified string is null or an Empty string.

Console.WriteLine(string.IsNullOrEmpty(null));           // True
Console.WriteLine(string.IsNullOrEmpty(""));             // True
Console.WriteLine(string.IsNullOrEmpty(" "));            // False
Console.WriteLine(string.IsNullOrEmpty("  "));           // False

string.IsNullOrWhiteSpace(): Indicates whether a specified string is null, empty, or consists only of white-space characters.

Console.WriteLine(string.IsNullOrWhiteSpace(null));     // True
Console.WriteLine(string.IsNullOrWhiteSpace(""));       // True
Console.WriteLine(string.IsNullOrWhiteSpace(" "));      // True
Console.WriteLine(string.IsNullOrWhiteSpace("  "));     // True