Login control asp.net stop singingin?

[dartzman]

Hello so i wanna check on data base is user already logged in then if hes logged stop login in here is sample of my code thx for help.\[code\]protected void Login1_LoggingIn(object sender, LoginCancelEventArgs e) { String name = ((Login)LoginView1.FindControl("Login1")).UserName; SqlConnection source_db = new SqlConnection(); source_db.ConnectionString = ConfigurationManager.ConnectionStrings["source"].ConnectionString;//konfiguracja polaczenia z web.cfg SqlCommand sql_polecenie3 = new SqlCommand("select Status from aspnet_Users where UserName='" + name + "';", source_db); try { source_db.Open();//otwiera polaczenie if ((int)sql_polecenie3.ExecuteScalar() == 1) { Label1.Visible = true; } else { Label1.Visible = false; } source_db.Close();//zamyka polaczenie } catch (Exception) { source_db.Close();//zamyka polaczenie } }\[/code\]