ASP.NET

<authentication mode="None">
  <forms loginUrl="~/Signin" timeout="2880" />
</authentication>

FormsAuthentication.Authenticate(txtEmailAddress.Text.Trim(), txtPassword.Text);

if (!HttpContext.Current.User.Identity.IsAuthenticated) FormsAuthentication.RedirectToLoginPage();

[WebMethod]
public string Save(BusinessException exception, BusinessException oldexception)
{
     UserContext userContext = GetCurrentUserDataContext();
     IList<string> lineExtIds = exception.LineExtIds;
     IList<string> ListExtIds = exception.ListExtId;
     string username = null;

     //alert message should be here

     //if yes
       {
         Presenter.Save(lineExtIds,userContext.Login,userContext.Profile);
       }

     //if no
       {
            return;
       }
return "succeed";
}