title: ASP.NET authentication: adding similar part (domain) to all usernames
body: <p>I am working on an authentication process for an ASP.NET web app. All my usernames follow the same template: <em>login@domain.com</em>. Domain is always the same.</p>
  
  <p>My question is: Is there a way to add the part <em>@domain.com</em> automatically, so users could just type in their <em>login</em> in the username field? </p>
  
  <p>Please, let me know if I need to provide some additional info to find the answer to this question.</p>