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copied!<p>I assume that the <code>CompareValidator</code> does not accept your format.</p> <p>The CompareValidator is pretty particular about the dates that it will accept. For example, the following dates are not considered valid:</p> <ul> <li>January 1, 2001</li> <li>Jan 1, 2001</li> <li>Fri 04 May 2012</li> </ul> <p>The CompareValidator requires a date that looks like this:</p> <ul> <li>1/1/2001</li> <li>1-1-2001</li> <li>5/4/2012</li> </ul> <p><a href="http://www.informit.com/articles/article.aspx?p=25461&seqNum=5" rel="nofollow">http://www.informit.com/articles/article.aspx?p=25461&seqNum=5</a></p> <p>Without having tested it, you could try to use a hidden TextBox(<code>display:none</code>) with the accepted date format as Text. Then set the Validator's <code>ControlToValidate</code> to the "hiddenfield". You need to synchronize both TextBoxes' Text properties with their hiddenfields. Maybe this gives you an idea. </p> <p><strong>Edit</strong>: Ok, i've tried to get it working what i've said and actually it is working :) Maybe there's some refactoring possible, but have a look yourself.</p> <p>To hide the TextBox with the working date format i've used CSS:</p> <pre><code><style type="text/css"> .hidden { display:none; } </style> </code></pre> <p>These JS-functions are called when the user changes a date via CalendarExtenders:</p> <pre><code><script type="text/javascript"> function dateChangedStart(sender, args) { var selectedDate = sender.get_selectedDate(); var hiddenStart = $get("txtStartDateHidden"); var validator = $get("startDateCompareValidator"); hiddenStart.value = dateToString(selectedDate); ValidatorValidate(validator); } function dateChangedEnd(sender, args) { var selectedDate = sender.get_selectedDate(); var hiddenEnd = $get("txtEndDateHidden"); var validator = $get("startDateCompareValidator"); hiddenEnd.value = dateToString(selectedDate); ValidatorValidate(validator); } function dateToString(d) { var year = d.getFullYear(); var month = d.getMonth() + 1; //months are zero based var day = d.getDate(); return year + "/" + month + "/" + day; } </script> </code></pre> <p>This is the rest of the sample page:</p> <pre><code><div> <asp:TextBox ID="txtStartDate" CausesValidation="false" ReadOnly="true" runat="server"> </asp:TextBox> <asp:TextBox ID="txtStartDateHidden" CssClass="hidden" ValidationGroup="DateCheck" CausesValidation="true" ReadOnly="false" runat="server"> </asp:TextBox> <ajax:CalendarExtender ID="StartDateCalendar" TargetControlID="txtStartDate" runat="server" OnClientDateSelectionChanged="dateChangedStart" Format="ddd MM dd, yyyy"> </ajax:CalendarExtender> <asp:CompareValidator ID="startDateCompareValidator" runat="server" EnableClientScript="true" ControlToValidate="txtStartDateHidden" Display="Static" Operator="LessThanEqual" ValidationGroup="DateCheck" ControlToCompare="txtEndDateHidden" Enabled="true" Type="Date" Text="Startdate should be <= enddate"> </asp:CompareValidator> <asp:TextBox ID="TxtEndDate" CausesValidation="false" ReadOnly="true" runat="server"> </asp:TextBox> <asp:TextBox ID="txtEndDateHidden" CssClass="hidden" ValidationGroup="DateCheck" CausesValidation="true" ReadOnly="false" runat="server"> </asp:TextBox> <ajax:CalendarExtender ID="EndDateCalendar" TargetControlID="txtEndDate" runat="server" OnClientDateSelectionChanged="dateChangedEnd" Format="ddd MM dd, yyyy"> </ajax:CalendarExtender> <asp:Button ID="BtnSubmit" CausesValidation="true" ValidationGroup="DateCheck" runat="server" Text="Submit" /> </div> </code></pre>

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