How to use IsNullOrEmpty in VB.NET?

Why doesn't the following compile in VB.NET?

Dim strTest As String
If (strTest.IsNullOrEmpty) Then MessageBox.Show("NULL OR EMPTY")
End if

3 Answers

IsNullOrEmpty is 'shared' so you should use it that way:

If String.IsNullOrEmpty(strTest) Then

You can actually just compare to an empty string:

If strTest = "" Then MessageBox.Show("NULL OR EMPTY")
End If

String.IsNullOrEmpty is a shared (or static, in C#) method.

Dim strTest As String
If (String.IsNullOrEmpty(strTest)) Then MessageBox.Show("NULL OR EMPTY")
End if