Dim Result As DialogResult = MessageBox.Show("是否将明细表数据全部更改(不包含下料组)","提示",MessageBoxButtons.YesNo)
If e.DataRow.OriginalValue("班组") Is Nothing Then
Return
Else
If Result = DialogResult.Yes Then
For Each dr3 As DataRow In drs3
For Each dr1 As DataRow In drs1
dr1("班组") = e.DataRow("班组") '修改构件清单表
Next
dr3("班组") = e.DataRow("班组") '修改检测明细表(不包含班组等于下料组的行)
Next
End If
请问这个怎么修改,如果修改前的值是空值就不弹出提示框,否则弹出提示框