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Object Null reference Error - dropdown list inside webdatagrid

I have  webdatagrind which is pulling data from database. there is one dropdownlist inside webdatagrid  which is also pulling data from the database.

the problem is

I can able to removing selected record using check box from the grid successfully and then reloading grid again from the database .

But i am getting error with (dropdownlist.selectitem.text) second time when  i  select check box and then submit.

Thanks for your help