... the modaLookupData data adapter, and it is used to update the data table. The Update method of modaLookupData is executed, followed by the AcceptChanges method of the dtFromGrid data table. ... hassles trying to track the data table directly. dtFromGrid = CType(dgTableData.DataSource, DataTable) ' Commands necessary to actually post back to server. modaLookupData .Update( dtFromGrid) ... Try ' Update the data adapter and data table to reflect the new data, ' and reassign the data source of the data grid. modaLookupData = New OleDb.OleDbDataAdapter("Select...