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    copied!<p>Aspx File:</p> <pre><code> &lt;tr&gt; &lt;td align="right"&gt; Start Date: &lt;/td&gt; &lt;td align="left"&gt; &lt;telerik:RadDatePicker ID="RadDtpFromDate" runat="server" Calendar-EnableShadows="true" AutoPostBack="true" Culture="en-IN" DateInput-DateFormat="dd-MMM-yyyy" DateInput-EmptyMessage="DD-MMM-YYYY" ShowPopupOnFocus="true" ToolTip="Input Date" ZIndex="30001" onselecteddatechanged="RadDtpFromDate_SelectedDateChanged" /&gt; &lt;asp:RequiredFieldValidator runat="server" ID="rfvFromDate" Display="None" ControlToValidate="RadDtpFromDate" InitialValue="" ValidationGroup="FinalSave" ErrorMessage="From Date is Mandatory" ForeColor="Red"&gt;&lt;/asp:RequiredFieldValidator&gt; &lt;ajaxToolkit:ValidatorCalloutExtender ID="vceFromDate" TargetControlID="rfvFromDate" runat="server"&gt; &lt;/ajaxToolkit:ValidatorCalloutExtender&gt; &lt;asp:CustomValidator ID="cvFromDate" runat="server" ControlToValidate="RadDtpFromDate" Display="None"&gt;&lt;/asp:CustomValidator&gt; &lt;ajaxToolkit:ValidatorCalloutExtender ID="vceRadFromDate" runat="server" TargetControlID="cvFromDate"&gt; &lt;/ajaxToolkit:ValidatorCalloutExtender&gt; &lt;/td&gt; &lt;td align="right"&gt; End Date: &lt;/td&gt; &lt;td align="left" colspan="2"&gt; &lt;telerik:RadDatePicker ID="RadDtpToDate" runat="server" Calendar-EnableShadows="true" AutoPostBack="true" Culture="en-IN" DateInput-DateFormat="dd-MMM-yyyy" DateInput-EmptyMessage="DD-MMM-YYYY" ShowPopupOnFocus="true" ToolTip="Input Date" ZIndex="30001" onselecteddatechanged="RadDtpToDate_SelectedDateChanged" /&gt; &lt;asp:RequiredFieldValidator runat="server" ID="rfvToDate" Display="None" ControlToValidate="RadDtpToDate" InitialValue="" ValidationGroup="FinalSave" ErrorMessage=" To Date is Mandatory" ForeColor="Red"&gt;&lt;/asp:RequiredFieldValidator&gt; &lt;ajaxToolkit:ValidatorCalloutExtender ID="vceToDate" TargetControlID="rfvToDate" runat="server"&gt; &lt;/ajaxToolkit:ValidatorCalloutExtender&gt; &lt;asp:CustomValidator ID="cvToDate" runat="server" ControlToValidate="RadDtpToDate" Display="None"&gt;&lt;/asp:CustomValidator&gt; &lt;ajaxToolkit:ValidatorCalloutExtender ID="vceRadToDate" runat="server" TargetControlID="cvToDate"&gt; &lt;/ajaxToolkit:ValidatorCalloutExtender&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>Cs File :</p> <pre><code> if (RadDtpFromDate.SelectedDate &gt; RadDtpToDate.SelectedDate) { dateCompareValidator.IsValid = False; return; } </code></pre> <p>Now Try this..................</p>
 

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