主题：各位高手，如何计算教龄？

参考代码

If e.DataCol.name = "出生日期" Then
    If e.newvalue <> Nothing Then
        Dim y As Integer = e.NewValue.year
        If format(e.newvalue, "MMdd") <= Format(Date.Today, "MMdd") Then
            e.DataRow("年龄") = Date.Today.Year - y
        Else
            e.DataRow("年龄") = Date.Today.Year - y -1
        End If
    Else
        e.DataRow("年龄") = Nothing
    End If
End If