This is the new approach:

                oCommand.CommandText = cSQL

                ' Only add the parameters if we have some
                If oParameters2.Count > 0 Then
                    For Each oDataParameter In oParameters2
                        oCommand.Parameters.Add(oDataParameter)
                    Next
                End If

                oDataAdapter.SelectCommand = oCommand

                nResult = oDataAdapter.SelectCommand.ExecuteNonQuery()

However, it happens again today. This is executed several times per day. It is the same command coming in from the same class. The error is:

Object reference not set to an instance of an object.

The stack trace is:

at System.Data.ProviderBase.DbReferenceCollection.AddItem(Object value, Int32 tag)
   at System.Data.OleDb.OleDbReferenceCollection.Add(Object value, Int32 tag)
   at System.Data.ProviderBase.DbConnectionInternal.AddWeakReference(Object value, Int32 tag)
   at System.Data.OleDb.OleDbConnection.AddWeakReference(Object value, Int32 tag)
   at System.Data.OleDb.OleDbCommand.PropertiesOnCommand(Boolean throwNotSupported)
   at System.Data.OleDb.OleDbCommand.InitializeCommand(CommandBehavior behavior, Boolean throwifnotsupported)
   at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
   at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
   at System.Data.OleDb.OleDbCommand.ExecuteNonQuery()
   at Framework.Framework.Data.SQLUpdate(String tcSQL, Boolean tlUpdate)

The SQL command is:

UPDATE MagazineNETSchedule SET ModUser=0,ModDate={^2007/01/05 07:48:32},Hit=? WHERE Numero=?

I just can't understand why this is happening at once and works at 99.9% of the time.