ASP.Net Connection string Error: Object reference not set to an instance of an object

Last Reply 3 months ago By pandeyism

Posted 3 months ago

I was trying to implements gridview sorting system from this articles :

Handle Sorting event in GridView in ASP.Net

But, after I've modificated the code to suit it with my project it happens to be "NullReferenceException Was Unhandled By User Code".

Screenshot : 

https://i.paste.pics/1cd0b87cdab402d9fbf9489761a9d0dc.png

What should I do ?