Dim dt1 As Date = e.Form.Controls("DateTimePicker1").Value

Dim xh As String = e.Form.Controls("TextBox1").value

If dt1 <> Nothing Then

    

    xh = Format(dt1,"yyyyMMdd")

    If xh.StartsWith(xh) = False

        Dim max As String

        Dim idx As Integer

        max = e.DataTable.Compute("Max(提案序号)","日期 = #" & dt1 & "# And [_Identify] <> " & e.DataRow("_Identify")) \'取得该天的最大编号

        If max > "" Then \'如果存在最大编号

            idx = CInt(max.Substring(9,3)) + 1 \'获得最大编号的后三位顺序号,并加1

        Else

            idx = 1 \'否则顺序号等于1

        End If

        xh = xh & "-" & Format(idx,"000")

    End If

End If