@Prog! - ASP.NET(C#) AJAX -

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>

<asp:TextBox ID="tbYmd" runat="server" MaxLength="10" Width="80px"></asp:TextBox>

<AjaxToolkit:MaskedEditExtender ID="MaskedEditExtender1" runat="server"
 TargetControlID="tbYmd"
        Mask="9999/99/99"
        MaskType="Date"
        UserDateFormat="YearMonthDay">
</AjaxToolkit:MaskedEditExtender>