textbox - asp.net "compare validator" validation -

i trying validate fromdate & todate textboxes in asp.net using compare validator script is:

<table><tr><td> <asp:scriptmanager id="scriptmanager1" runat="server"> </asp:scriptmanager>              <asp:label id="label1" runat="server" text="fromdate:"> </asp:label>     <asp:textbox id="fromdatetxt" runat="server" height="21px" width="103px" ></asp:textbox>     <ajaxtoolkit:calendarextender id="fromdatetxt_calendarextender" runat="server"          enabled="true" targetcontrolid="fromdatetxt">     </ajaxtoolkit:calendarextender>      </td>            <td>                <asp:label id="label2" runat="server" text="todate:"></asp:label>                <asp:textbox id="todatetxt" runat="server" height="21px" width="105px" ></asp:textbox>                <ajaxtoolkit:calendarextender id="todatetxt_calendarextender" runat="server"                     enabled="true" targetcontrolid="todatetxt">                </ajaxtoolkit:calendarextender>      </td>     <asp:comparevalidator id="comparevalidatordate" runat="server" controltocompare="todatetxt"     controltovalidate="fromdatetxt" display="none" errormessage="from date cannot greaterthan date"     operator = "lessthanequal" type="date" validationgroup="datevalidation"></asp:comparevalidator>                  <td>                    <asp:button id="button1" runat="server" text="submit" onclick="button1_click" validationgroup="datevalidation" />                    <asp:validationsummary id="validationsummarydate" showmessagebox="true" showsummary="false"                   validationgroup="datevalidation" runat="server" /></td></tr></table>      </asp:panel> 

this working fine! i'm getting message box when click button. want message box moment clicked date in todate in calendar control, , textboxes must clear. please me out .

you can solve problem using "page_clientvalidate" function of javascript , "onclientdateselectionchanged" event of calendarextender.

you not need change comparevalidator i.e.

<asp:comparevalidator id="comparevalidatordate" runat="server" controltocompare="todatetxt"             controltovalidate="fromdatetxt" display="none" errormessage="from date cannot greater date"             operator="lessthanequal" type="date" validationgroup="datevalidation"></asp:comparevalidator> 

you need add onclientdateselectionchanged event calendarextender

<ajaxtoolkit:calendarextender id="todatetxt_calendarextender" runat="server" enabled="true"                 targetcontrolid="todatetxt" onclientdateselectionchanged="validate" > 

"validate" here javascript function. in function need use "page_clientvalidate" method of javascript as

var validate = function () {     var isvalid = page_clientvalidate("datevalidation"); //parameter validation group     if (!isvalid) {         $("#<%= todatetxt.clientid %>").val(''); //jquery clear textbox     } } 

you can modify "validate" function per convenience.

i hope helped.

regards,

samar