主题：[求助]表格清空当前行列数据无效

If e.DataCol.Name = "diqu" Then
    Dim dr As DataRow
    dr = e.DataTable.Find("cgddiqu = '" & e.NewValue & "'")
    If dr IsNot Nothing Then
        MessageBox.Show("地区已经存在!")

        e.Cancel = true
    End If
End If