Check Session variable and Redirect to login page before page load

Question

How can I check a variable and redirect to another page before the page loads using ASP.NET?

I'm aware of the life cycle, and PageInit() sounds like it would be right, but I can't seem to find anywhere to put the code without and error within Visual Studio.

I can't put the onpageinit="" within the first line of my page declaration. Am I suppose to put it somewhere different? My page declaration looks like:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="dashboard.aspx.cs" Inherits="dashboard" MasterPageFile="~/Design.master" %>

This is the code that I want to run on the page load:

    // Check if the user is logged in, if not send them to the login page
    if (session.logged_in == false)
    {
        // Redirect the user to the login page
        Response.Redirect("login.aspx");

    }

Answer 1

You have to override the OnInit method of the page. Place this just above (order doesn't matter, but I believe organization is important) your Page_Load event in your code behind...

protected override void OnInit(EventArgs e)
{
    base.OnInit(e);

    // your code goes here
}

Also, depending on what you are trying to accomplish, I would suggest looking into FormsAuthentication. With that you can simply specify secure folders and a login page and .NET handles kicking the visitor to the login page if they are not authenticated.