Actually my doubt is i have 10 webforms in my application.based on the need i will call that pages.

And am calling(open) one form from another form by using javascript(window.open).Now i want to close that opened form from the first one.

Can anyone suggest me how to solve this one?

This article explains the same

http://www.gotfusion.com/tutsTD/javaclose.cfm

Try this sample, in this example Child page will be closed from Parent page. But functionality will not work if parent page got refreshed mean while chield page is open.

<script type="text/javascript">
var FirstChild;
var SecondChild;
function Open1(){FirstChild = window.open("Default6.aspx","FirstChild");}
function Open2(){SecondChild = window.open("Default7.aspx","SecondChild");}
function close1(){if(FirstChild){FirstChild.close();}}
function close2(){if(SecondChild){SecondChild.close();}}
</script>
<form id="form1" runat="server">
<div>
    <asp:Button ID="Button1" OnClientClick="Open1() ; return false;" runat="server" Text="Open1" />
    <asp:Button ID="Button3" OnClientClick="close1() ; return false;" runat="server" Text="Close1" />
    <br />
    <asp:Button ID="Button2" OnClientClick="Open2() ; return false;" runat="server" Text="Open2" />
    <asp:Button ID="Button4" OnClientClick="close2() ; return false;" runat="server" Text="Close2" />
</div>
</form>

Ya this is working fine ....

Thank u very much 4 ur precious information sir.

Really thank u very much for ur information