If the user selects an On Leave Start Date then they decide the field should be empty. they cannot delete the data.

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ASP.NET4

hi
I have a date picker control once the user enters the OnLeaveStartDate ,and then if he decides not to enter the date ,the date is not being disabled,on pressing the backspace,the entire page Traverses back.

below is what I'm doing

 <div class='sxro sx3co'>
                        <div class="sxlb">
                            <asp:Label ID="lblSupplierOnLeaveStartDate" runat="server" AssociatedControlID="dpSupplierOnLeaveStartDate"
                                Text="On-leave Start Date"></asp:Label></div>
                        <div class="sxlm">
                            <asp:DatePicker  runat="server" ID="dpSupplierOnLeaveStartDate" DateInput-ReadOnly="true"
                                DateInput-DateFormat="MM-dd-yyyy" Width="99%">
                                <ClientEvents OnPopupClosing="FocusOnPopUpButton"  önDateSelected="SetSupplierOnLeaveStartDateSelected" />
                                <Calendar ID="calSupplierOnLeaveStartDate"  runat="server" EnableKeyboardNavigation="true"
                                    CausesValidation="false">
                                </Calendar>
                            </asp:DatePicker>
                            <div class="vldx">
                                <asp:RequiredFieldValidator runat="server" ID="rfvSupplierOnLeaveStartDate" ControlToValidate="dpSupplierOnLeaveStartDate"
                                    class="errmsg" ValidationGroup="grpSupplierInformation" Display="Dynamic" ErrorMessage="SUPPLIER_ONLEAVE_START_DATE_MANDATORY"
%>'
                                    Enabled="false" />
                                <asp:CompareValidator ID="cmpSupplierOnLeaveStartDate" ControlToValidate="dpSupplierOnLeaveStartDate"
                                    class="errmsg" ValidationGroup="grpSupplierInformation" Operator="GreaterThanEqual"
                                    Display="Dynamic" ValueToCompare='<%# DateTime.Today.ToShortDateString() %>'
                                    Type="Date" runat="server" ErrorMessage="SUPPLIER_ONLEAVE_START_DATE_GRATER_THAN_CURRENT_DATE" %>'></asp:CompareValidator>
                            </div>
                        </div>
                        <div class="sxlb">
                            <asp:Label ID="lblSupplierOnLeaveEndDate" runat="server" AssociatedControlID="dpSupplierOnLeaveEndDate"
                                Text="On-leave End Date"></asp:Label></div>
                        <div class="sxlm">
                            <:asp:DatePicker  runat="server" ID="dpSupplierOnLeaveEndDate" DateInput-ReadOnly="true"
                                DateInput-DateFormat="MM-dd-yyyy" Width="99%">
                                <ClientEvents OnPopupClosing="FocusOnPopUpButton"  önDateSelected="SetSupplierOnLeaveEndDateSelected" />
                                <Calendar ID="calSupplierOnLeaveEndDate"  runat="server" EnableKeyboardNavigation="true"
                                    CausesValidation="false">
                                </Calendar>
                            </:DatePicker>
                            <div class="vldx">
                                <asp:RequiredFieldValidator runat="server" ID="rfvSupplierOnLeaveEndDate" ControlToValidate="dpSupplierOnLeaveEndDate"
                                    class="errmsg" ValidationGroup="grpSupplierInformation" Display="Dynamic" ErrorMessage="SUPPLIER_ONLEAVE_END_DATE_MANDATORY" %>'
                                    Enabled="false" />
                                <asp:CompareValidator ID="cmpSupplierOnLeaveEndDate" ControlToValidate="dpSupplierOnLeaveEndDate"
                                    class="errmsg" ValidationGroup="grpSupplierInformation" Operator="GreaterThanEqual"
                                    Display="Dynamic" ControlToCompare="dpSupplierOnLeaveStartDate" Type="Date" runat="server"
                                    ErrorMessage="SUPPLIER_ONLEAVE_END_DATE_GRATER_THAN_ONLEAVE_START_DATE" %>'></asp:CompareValidator>
                            </div>
                        </div>
                        <div class='sxroend'>
                        </div>
                    </div>
                </div>

the condition is :Onleavestartdate should be greater than currentdate,and if user has entered Onleavestartdate he also has to enter OnLeaveEndDate which should be greater than OnLeavestartdate.
Everything is working fine ,the only problem is that if i enter onleavestartdate and then i plan not to enter the date since it is not a mandatory field,it is not being deselected.

Any help would be highly admired.
thanks in advance.