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I understand the difference between Client-side and Server-side scripting. I have a javascript function and variable in my MasterPage : <script language="JavaScript" type="text/javascript"> var needToConfirm = false; window.onbeforeunload = confirmExit; function confirmExit() { if (needToConfirm) { needToConfirm = false; return "Currently in edit mode. If you leave the page now then you will lose unsaved changes." } } </script> Given the fact that on my ASP.NET (Client-side) I can change the value of my needToConfirm variable to true onClientClick but by default it is false. Here's an example. <asp:Button ID="btnEdit" runat="server" Text=" Edit " onclick="btnEdit_Click" OnClientClick="needToConfirm = true;" /> Now the question here is when on the C# (Server-side) I have to set the needToConfirm to true under an if-statement but not necessarily on Page_Load : private void SetDefault() if (Session[def.ID_CUST] != null) { //I want to change the variable value here } } Thanks. UPDATE I'm using .NET 2.0 Classic and WebForms

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