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http://articles.techrepublic.com.com/5100-10878_11-5764862.html

The null keyword is a literal that represents a null reference with the C# .NET environment. You may use the null keyword to check or assign the value of an object. For example, the following C# code determines if a string value is null: 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