User Authentication

You can achieve this by using the  and  elements in your Web.config file. Here's an example:

  
    
      
    
  
  
    
      
        
      
    
  

Here's how it works:

• The  element denies access to all anonymous users (i.e., users who have not logged in). The ? is a wildcard character that matches all anonymous users.
• The  element specifies that the following authorization settings only apply to the Login.aspx page.
• The  element allows all users (including anonymous users) to access the Login.aspx page. This is necessary because we want to allow users to access the login page even if they haven't logged in yet.

With this configuration, when an anonymous user tries to access any page other than Login.aspx, they will be redirected to the Login.aspx page. Once they log in, they will be able to access the other pages.

Note that you'll also need to configure the authentication mode in your Web.config file. For example:

 
   
     
   
 

This sets the authentication mode to Forms authentication and specifies that the login page is Login.aspx.