title: ASP.NET Web Forms password authenication on a single page
body: <p>I´m building a site using ASP.NET with C#, built from the Web Forms template.</p>
  
  <p>One of the pages needs to be protected with a password, much like the PHP authenticate. </p>
  
  <p>I´ve tried several samples but then all the pages in the application is protected, I just need the authentication when a specific page is requested. </p>
  
  <p>Any good and simple ways to implement this? </p>