Working with null values in the .NET Framework

A null value is a value that doesn't refer to any object. It's the default value of reference-type variables(e.g., class, interface, delegate, string).



For example:

string sTest = "Test";
if (sTest == null) {
Console.WriteLine("sTest is Null")
}

This code works without any problems with C#,but there's no VB.NET equivalent of the null keyword. Instead,VB.NET uses the Nothing keyword. The following code demonstrates its use:

Dim sTest As String
If (sTest Is Nothing) Then
Console.WriteLine("sTest is Null")
End If