主题：帮助文档有条代码不明白

Select Case e.Path
    Case "AddNew.htm"
        Dim nms() As String = {"产品","客户","数量","单价","日期"}
        For  Each nm As String In nms
            If e.PostValues.ContainsKey(nm) = False Then
                e.AppendCookie("error","请输入" & nm)
                Return
            End If
        Next
        Dim dr As DataRow = DataTables("订单").AddNew()
        For  Each nm As String In nms
            dr(nm) = e.PostValues(nm)
        Next
        dr.Save()
        e.WriteString(dr("_Identify")) '返回主键列的值给客户端
        dr.Remove() '移除此行
End Select

这是移动开发文档里的代码。

dr.Remove() ，为什么要在最后加一个移除此行的代码呢？请老师指点