Compare validator - From Time and To Time

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ASP.NET

SQL-Server

<asp:Gridview ID="GridView01" runat="server" Width='100%' ShowFooter="true" AutoGenerateColumns="false"> <columns>
<asp:BoundField DataField="SI" HeaderText="SI" />

<asp:TemplateField HeaderText="From Time">
<itemtemplate>
<asp:TextBox ID="txtFromTime" CssClass="txtLeftNormal" autocomplete="off" size="5" MaxLength="6" runat="server" text='<%#Container.dataitem("FromTime")%>'>

<ajaxToolkit:MaskedEditExtender ID="MaskedEditExtender2" runat="server" TargetControlID="txtFromTime" Mask="99:99" MessageValidatorTip="true" OnFocusCssClass="MaskedEditFocus" önInvalidCssClass="MaskedEditError" MaskType="Time" AcceptAMPM="false" ErrorTooltipEnabled="True" />
<ajaxToolkit:MaskedEditValidator ID="MaskedEditValidator2" runat="server" ControlExtender="MaskedEditExtender2" ControlToValidate="txtFromTime" ValidationGroup="ValidGroup1" IsValidEmpty="true" EmptyValueMessage="Time is required" InvalidValueMessage="Time is invalid" Display="Dynamic" CssClass='lblValidate' TooltipMessage="Railway Time" EmptyValueBlurredText="*" InvalidValueBlurredMessage="ERROR : Invalid Time!! " />

<asp:requiredfieldvalidator id="Requiredfieldvalidator2" runat="server" ControlToValidate="txtFromTime" CssClass="lblValidateGroup" ErrorMessage="#" ValidationGroup="ValidGroup1" Text="#">

<footertemplate>
<asp:label id="Label15" Width="30" Runat="server" ForeColor='Red' CssClass='lblValidateGroup'>#



<asp:TemplateField HeaderText="To Time">
<itemtemplate>
<asp:TextBox ID="txtToTime" CssClass="txtLeftNormal" autocomplete="off" size="5" MaxLength="6" runat="server" text='<%#Container.dataitem("ToTime")%>'>

<ajaxToolkit:MaskedEditExtender ID="MaskedEditExtender3" runat="server" TargetControlID="txtToTime" Mask="99:99" MessageValidatorTip="true" OnFocusCssClass="MaskedEditFocus" önInvalidCssClass="MaskedEditError" MaskType="Time" AcceptAMPM="false" ErrorTooltipEnabled="True" />
<ajaxToolkit:MaskedEditValidator ID="MaskedEditValidator3" runat="server" ControlExtender="MaskedEditExtender3" ControlToValidate="txtToTime" IsValidEmpty="true" ValidationGroup="ValidGroup1" EmptyValueMessage="Time is required" InvalidValueMessage="Time is invalid" Display="Dynamic" CssClass='lblValidate' TooltipMessage="Railway Time" EmptyValueBlurredText="*" InvalidValueBlurredMessage="ERROR : Invalid Time!! " />
<asp:requiredfieldvalidator id="Requiredfieldvalidator3" runat="server" ControlToValidate="txtToTime" CssClass="lblValidateGroup" ErrorMessage="#" ValidationGroup="ValidGroup1" Text="#">

<footertemplate>

I want to Compare FromTime and ToTime

regards,
Nirmal.M