String.IsNullOrEmpty() vs String.IsNullOrWhiteSpace

String.IsNullOrEmpty() vs String.IsNullOrWhiteSpace

So which would you use?

String.IsNullOrEmpty	String.IsNullOrWhiteSpace	Comments
.NET 2.0 and above	.NET 4 and above
Indicates whether the specified string is null or an Empty string.	Indicates whether a specified string is null, empty, or consists only of white-space characters.

reference: http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx

- String.IsNullOrEmpty exists since .NET 2.0 and above

- String.IsNullOrWhiteSpace exists in .NET 4.0 and above

But which should you use?

Here's some useful answer from stackoverflow. 

Example:

string testString = "";
Console.WriteLine(string.Format("IsNullOrEmpty : {0}", string.IsNullOrEmpty(testString)));
Console.WriteLine(string.Format("IsNullOrWhiteSpace : {0}", string.IsNullOrWhiteSpace(testString)));
Console.ReadKey();

Resutl :
IsNullOrEmpty : True
IsNullOrWhiteSpace : True

************************************************************
string testString = " MDS   ";

IsNullOrEmpty : False
IsNullOrWhiteSpace : False

************************************************************
string testString = "   ";

IsNullOrEmpty : False
IsNullOrWhiteSpace : True

************************************************************
string testString = string.Empty;

IsNullOrEmpty : True
IsNullOrWhiteSpace : True

************************************************************
string testString = null;

IsNullOrEmpty : True
IsNullOrWhiteSpace : True

reference: 

http://stackoverflow.com/questions/6976597/string-isnulloremptystring-vs-string-isnullorwhitespacestring

happy coding!