maskedextender and calenderextender in asp.net

I am new person in asp.net. I have one text box and one calender image button in my asp.net application. I use the masked extender to display date in the textbox like yyyy-mm--dd. Also i use the calender extender for the purpose of clicking image button it will show the date in the textbox. I use the following code.

                                    &nbsp;<asp:ImageButton ID="imgdatefrom" runat="server" 
                                        ImageU开发者_C百科rl="~/images/calendar.jpeg" Height="19px" Width="20px"  />
                                    &nbsp;&nbsp;<asp:Label ID="lblTo"  runat="server" Text="End Date" 
                                        ForeColor="Black" Font-Size="Small"></asp:Label>
                                    <asp:Label ID="enddateval" runat="server" ForeColor="Red" Text="*"></asp:Label>
                                    &nbsp;<asp:CalendarExtender ID="txtDateFrom_CalendarExtender" runat="server" TargetControlID="txtDateFrom" Format="yyyy-MM-dd" PopupButtonID="imgdatefrom"
                                                        TodaysDateFormat="yyyy d, MMMM">
                                        </asp:CalendarExtender>

While I executing that code and selecting date by clicking image button the selected date will not displayed in the textbox. Can anyone know how to solve the problem. Thank you

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Instead of MaskedExtender you just use standard TextBox Control. It will work.