If you want to create a abstract class in VB.NET it’s done by using “MustInherit” keyword.You can not create an object of a class which is marked as “MustInherit”. When you define “MustInherit” keyword for class you can only use the class by inheriting. Note :- There was huge typo in my previous versions for the above two questions. I hope some one has not lost good oppurtunity because of the same. Thanks to all my readers for pointing it out.