dynamically adding and deleting rows in gridview and saving

Question

Hi,

 

I refer to the below tutorial.

 

http://www.c-sharpcorner.com/UploadFile/8c19e8/dynamically-adding-and-deleting-rows-in-gridview-and-saving/

 

Now, I'd like to make it such a way that when the user selected the dropdownlist with the key , the row will be filled up with the value and the index row number.

 

How can I achieve that?