I got this error"ObjectDataSource could not find a non-generic method" when trying to update or delete a record from GridView that uses ObjectDataSourse whose data source is configured to a tableadapter of a dataset.
I fixed this by specifying parameter "DataKeyNames" in a gridView control and changing OldValuesParameterFormatString="original_{0}" to OldValuesParameterFormatString="{0}" parameter of ObjectDataSource.
