CODEWITHSUNDEEP
c#asp.net
THE LIFE-TIME LEARNER
THE LIFE-TIME LEARNER

Reputation: 1522

C# web Application - Run a Specific type of Code on Every Page Load

I have a created a Simple LOGIN form...I want to Check Session["UserId"] is null or not...on every page load.

Instead of writing on every Page to Check Session["UserId"] is null or not.

what is the alternative way to write a common Code and call every page except LOGIN and REGISTRATION Form

if Session["UserId"] is null then i can easily Redirect to LOGIN Form or Else the Code is ongoing

If Possible you can give me Code with example.. Thank You!!

Upvotes: 5

Views: 720

Answers (3)

Gian Paolo
Gian Paolo

Reputation: 4249

I usually create a class MyBasePage, inheriting from System.Web.UI.Page, and put there all (or most) of the common logic shared by all pages in my web application.

When creating a new aspx page, you have to change its declaration so it inherits from MyPageBase and not from Page

Then MyBasePage has a virtual method (or property) RequiresLogin, which returns true. For Login and registration form, you override it returning false.

Finally, in the Load handler for MyPageBase, you add something such:

if (RequiresLogin && !UserIsAlreadyAuthenticated)
    Response.Redirect ("Login.aspx");

You can extend this pattern to handle what you think should be common to all of your pages

Upvotes: 1

hassan.ef
hassan.ef

Reputation: 1350

use this code in Global.asax:

public class Global : System.Web.HttpApplication
{ ...
    void Application_AcquireRequestState(object sender, EventArgs e)
    {            
        HttpContext context = HttpContext.Current;
        // CheckSession() inlined
        if (context.Session["UserId"] == null)
        {
          context.Response.Redirect("Login.aspx");
        }
    }
  ...
}

Upvotes: 5

user5954882
user5954882

Reputation:

The first thing that comes to mind are attributes. Or better; create your own attribute. Check out this link: https://learn.microsoft.com/en-us/dotnet/standard/attributes/writing-custom-attributes Maybe it gives you an idea

Upvotes: 0

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