Dim dr1 As DataRow = e.DataRow
Select Case e.DataCol.Name
Case "进价","数量","款项类型"
If dr1.IsNull("进价") OrElse dr1.IsNull("数量") OrElse dr1.IsNull("款项类型") Then
dr1("收款金额") = Nothing
dr1("返款金额") = Nothing
Else
If dr1("款项类型") = "收款"
dr1("收款金额") = dr1("进价") * dr1("数量")
dr1("返款金额") = Nothing
Else
dr1("返款金额") = dr1("进价") * dr1("数量")
dr1("收款金额") = Nothing
End If
End If
End Select