Union, Union all, Intersect and Except — July 9, 2018
Abstract class and Interface — August 3, 2017

Abstract class and Interface

“Tell me about Abstract class and Interface” – most of the times my interviews started with this renowned question and I know many of you likewise confronted it many times. I had memorized the definitions and differences like a parrot but really didn’t knew what they were and how different they were then. So what they are and how they are implemented in programming, lets dive deep. Continue reading

Object reference not set to an instance of an object! — July 9, 2017