How to know that which line throws an exception in c# code.
I facing Selection Out of range exception directly on browser, so i can't detect where is the problem.
I try debugging many times but can't find where is the problem.
[![enter image description here](https://i.stack.imgur.com/DSUpy.png)](https://i.stack.imgur.com/DSUpy.png) 
Please help me to solving this.