Principal Login : FormsAuthentication « Authentication Authorization « ASP.NET Tutorial

1. ASP.NET Tutorial
2. Authentication Authorization
3. FormsAuthentication

<%@Page language="C#" %>
<script runat="server">
protected void Page_Load(object o, EventArgs e) {
  if(IsPostBack) {
    if(AuthenticateUser(username.Text, password.Text)) {
      FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
      1,
      username.Text,
      DateTime.Now,
      DateTime.Now.AddMinutes(30),
      false,
      "superusers"
      );
      string encryptedTicket = FormsAuthentication.Encrypt(ticket);
      Response.Cookies.Add(new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket));
      Response.Redirect(FormsAuthentication.GetRedirectUrl(username.Text, false));
    }
    else {
      instructions.Text = "Please Try Again!";
      instructions.ForeColor = System.Drawing.Color.Red;
    }
  }
}

bool AuthenticateUser(string username, string password) {
  if((username == "TheUsername") &&
    (password == "ThePassword")) {
    return true;
  }
  return false;
}
</script>

<form runat="server">
<asp:Label runat="server" id="instructions" Text="Please Input your credentials" /><br> 
Username: <asp:Textbox runat="server" id="username" /><br>
Password: <asp:Textbox runat="server" id="password" TextMode="Password" /><br>
<asp:button runat="server" Text="LOGIN" />
</form>