AJAX Rating Control inside GridView ItemTemplate Error: Object reference not set to an instance of an object

yes, im getting GridViewRow but there is the problem in inserting MID into database it's passing null value. can it be related to primary Key and foreign key ??

I have primary key in my main table and the foreign key where im inserting MID

As you are saying you are getting GridViewRow, so let me know are getting the rowIndex?

If you are getting rowIndex then check based on rowIndex and DataKeys are you getting MID value or not.

thats the problem actually, im not getting the MID 

on rowindex it shows there is a null exception

still im wating for your answer