Populating data grid asp.net


I'm populating my data grid in aspx page by binding List<Exams> from a web service response. But I wanted the users to able to submit selected rows for storing in the table and others may have already been submitted. How do I conditionally populate the grid so users can only submit a row that haven't been already submitted? I mean, populate all of the rows on the grid regardless and differentiate the already submitted one from the others?  

Can somebody advice me please.

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UnifiedISConnect With a Mentor Commented:
When the user clicks submit, you should do a lookup in your database to see if the record already exists.

You could put a column in the grid that includes a boolean that tells whether or not the record exists already and just skip the insert if it exists
ube100Author Commented:
I didn't resolve my issue.
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