Select Case e.DataCol.name
Case "收租月","本月租金"
If e.DataRow.IsNull("合同号") = False Then
Dim filter9 As String = "合同号='" & e.DataRow("合同号") & "' and 收租月='" & e.DataRow("收租月") & "'"
Dim sum As Double = e.DataTable.Compute("sum(本月租金)",filter9)
e.DataTable.ReplaceFor("本期应收合计",sum,filter9)
End If
End Select