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09.09.2008 at 01:23PM PDT, ID: 23717096
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9.1

Error Operator '>' is not defined for type 'DBNull' and type 'DBNull'.

Asked by prinsbj in .NET, Visual Basic Programming, Microsoft Visual Basic.Net

When I save my record with RowValidating I get a error:

Operator '>' is not defined for type 'DBNull' and type 'DBNull'.

I've paste my code below.

The error is in this row:
        If OrderTransactionDataGridView.CurrentRow.Cells("QuantityOut").Value > OrderTransactionDataGridView.CurrentRow.Cells("MaxOut").Value Then

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Private Sub OrderTransactionDataGridView_RowValidating(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles OrderTransactionDataGridView.RowValidating
        Dim HasErrors As Boolean = False
        Dim ExtraErrMsg As String = "Current Status does not support data in this field"
 
        OrderTransactionDataGridView.EndEdit()
 
        Dim value As String
 
        ' The Unit Column
        If OrderTransactionDataGridView.CurrentRow.Cells("QuantityOut").Value > OrderTransactionDataGridView.CurrentRow.Cells("MaxOut").Value Then
            OrderTransactionDataGridView.CurrentRow.Cells("QuantityOut").ErrorText = ExtraErrMsg
            HasErrors = True
        Else
            OrderTransactionDataGridView.CurrentRow.Cells("QuantityOut").ErrorText = String.Empty
        End If
 
 
        ' Let 'em know they have an error, and don't let 'em leave
        If HasErrors Then
            e.Cancel = True
            Beep()
        End If
    End Sub
[+][-]09.09.2008 at 01:26PM PDT, ID: 22431860

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[+][-]09.09.2008 at 02:15PM PDT, ID: 22432375

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[+][-]09.09.2008 at 02:29PM PDT, ID: 22432505

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[+][-]09.09.2008 at 02:34PM PDT, ID: 22432543

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[+][-]09.09.2008 at 02:37PM PDT, ID: 22432573

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[+][-]09.09.2008 at 02:42PM PDT, ID: 22432601

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[+][-]09.09.2008 at 02:50PM PDT, ID: 22432668

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Zones: .NET, Visual Basic Programming, Microsoft Visual Basic.Net
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Solution Provided By: VBRocks
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.09.2008 at 02:55PM PDT, ID: 22432703

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[+][-]09.09.2008 at 02:57PM PDT, ID: 22432714

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[+][-]09.09.2008 at 03:02PM PDT, ID: 22432757

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[+][-]09.09.2008 at 03:05PM PDT, ID: 22432782

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[+][-]09.09.2008 at 03:10PM PDT, ID: 22432809

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