my grid view not working. when i click the sort on header it like not working . noting error and noting change. hopefully i can get explanation on my problem. No blame zone .just want get the solution here.
here below my code that i have been try but noting happen to my system.
![grid view](https://i.stack.imgur.com/wpuUg.png)

![vb.net](https://i.stack.imgur.com/rMrdQ.png)

![Sorting](https://i.stack.imgur.com/iwfgn.png)

hopefully i can get explanation.