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For example, a file might be missing, or a user might enter nonsensical values.A good Windows application must recover gracefully from these problems instead of abruptly shutting down.Here's my code Private Sub Save() For each c as control in Me. (It doesn't cost anything extra.) Private Declare Function Lock Window Update Lib "user32" (By Val hwnd As Long) As Long Lock Window Update(Me.
The only way I've found to do this is to cycle through every control and call it's . This is clunky though because you can see a flash in each text box as it's being validated. Select() End if Next c End Sub Each control has code in their Control_Validating event that fires off an errorprovider. Here's my code Private Sub Save() For each c as control in Me. Since only one lock can be in place at any one time you would want to lock the whole form during the validation phase. End Edit() End While End With grddetails is the name of grid, m_Bindingsrc Detail is datasource for grd Details According to This , You should be able to force the validation trigger using Begin Edit and End Edit. I am fetching Product description, MRP and other details in cell validating. private static readonly Method Info on Validating = typeof(Control). m_Sqlstr = "Select Distinct RFID, Prod_Code, Lot_No From Scan Stk Where Batch No = '" & str Batchno & "' " m_Sql Cmd = New Sql Command(m_Sqlstr, Con) Con. Close Connection) With m_Bindingsrc Detail While RFIDReader.
This exam objective covers the use of exception handling to create robust and fault tolerant applications. NET Framework provides some predefined exception classes to help you catch these unusual situations in your programs.