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Updating DateTime Value with DBNull

Last Modified: 2013-11-07
I'm trying to update a form that has a StartDate and EndDate column.  Neither of these are required fields and I can't figure out how to update with a null value.  Here's what I have:

        Dim prmStart As New SqlParameter("@Date_Start", SqlDbType.SmallDateTime)

        If Len(txtStartDate.Text) > 0 Then
            prmStart.Value = txtStartDate.Text
            prmStart.Value = DBNull.Value
        End If

This has to be easy but I'm stuck.

Thanks in advance,

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