I noted that in the Output window in Visual Studio there are the following messages:
.....other messages (but no errors or exceptions)....
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.IndexOutOfRangeException' occurred in System.Data.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll
............other exception messages..........
Can this help to solve my problem?