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Would you please change the MemberID
in the UpdateInfo method? The two lines should look like this:
The exception is thrown because you are attempting to find a cell using the HeaderText of the column, not its Name. A bit aside, I would like to point out that it is better to set the DataSource property after you have added all columns to the MasterTemplate.
I hope this helps. Let me know if you have further queries.
the Telerik team