update panel in ASP.net

# if you using this update pannel so apply :

OnClientClick="return onlineschoolvalid();" for validation .

this is working as a ajax method:

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

   <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering ="true"></asp:ScriptManager>
   <asp:UpdatePanel ID ="uppanel" runat ="server" ChildrenAsTriggers ="true" UpdateMode="Conditional"  >
   <ContentTemplate>


   </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>