Although it hasn't been a terrible burden in the past, determining whether an object reference is not the same as another object reference has historically involved a somewhat clumsy construct:
If Not (obj Is Nothing) Then
Visual Basic 2005 adds the IsNot keyword, making it possible to rewrite the previous example:
If obj IsNot Nothing Then
Sometimes, it's the little things that make a big difference. However, I am also looking forward another one for ASP.NET, which is:
If Not IsPostBack Then
We always use this property to check if this is the first time the web page is being processed. Why not just simply adding another one "IsNotPostBack".