I created a BO and set UpdateConcuranctyType to OptimisticTimeStamp as recommended. Set the field as ReadOnly to see if that helped (it didn't). When adding a record or editing an exiting record and saving the timestamp field is being "updated" and that is what generated the error:



BusinessLayerException

   An error occurred while saving an the data to the server.

DataLayerSavingException

   Cannot update a timestamp column.

SqlException

   Cannot update a timestamp column.



Source : MicroFour StrataFrame Business



Stack Trace:

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)

at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)

at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)

at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)

at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()

at System.Data.SqlClient.SqlDataReader.get_MetaData()

at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)

at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)

at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)

at System.Data.Common.DbCommand.ExecuteReader()

at MicroFour.StrataFrame.Data.DbDataSourceItem.InternalExecuteReader(DbCommand Command, Boolean IsTransactional, String TransactionKey)

at MicroFour.StrataFrame.Data.SqlDataSourceItem.UpdateRow(QueryInformation QueryInfo, DataRow RowToUpdate, ConcurrencyExceptionHandler ConcurrencyHandler, AddRowErrorHandler RowErrorHandler, Boolean RecreateCommand)

at MicroFour.StrataFrame.Data.DbDataSourceItem.UpdateRow(QueryInformation QueryInfo, DataRow RowToUpdate, ConcurrencyExceptionHandler ConcurrencyHandler, AddRowErrorHandler RowErrorHandler)

at MicroFour.StrataFrame.Data.DataLayer.UpdateDataTableThread(Object ThreadParams)

at MicroFour.StrataFrame.Data.DataLayer.SaveByForm(DataTable TableToSave, Boolean Transactional, String TransactionKey)

at MicroFour.StrataFrame.Business.BusinessLayer.SaveByForm(Boolean Transactional, String TransactionKey)

at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.Save(Boolean Transactional, String TransactionKey)

at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.Save()

at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.OnFormClosing(FormClosingEventArgs e)

at System.Windows.Forms.Form.WmClose(Message& m)

at System.Windows.Forms.Form.WndProc(Message& m)

at System.Windows.Forms.Control.ControlNativewindow.OnMessage(Message& m)

at System.Windows.Forms.Control.ControlNativewindow.WndProc(Message& m)

at System.Windows.Forms.Nativewindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)



How do I avoid this? I want to keep my timestamp column in the DB or something simular. I have read the other threads on this and tried the suggestions as far as setting "Return Alternate On Null" with a return value of "Nothing" which generated a VS2005 error.. didn't like the "Nothing". Tried the Date suggestion of "1/1/1800" with no joy either.. didn't like the date.. timestamp is not a date.. ( I knew that going in but it was worth a try.. lol.. getting a little despriate here...) So, what is left for me to do?



Regards



Robert