//Update User public bool UpdateUser(string username, string password) { List <User> listuser = new List <User>(); DBTodolist dB = new DBTodolist(); listuser = dB.GetListUsers(); // CheckUser already foreach (var i in listuser) { if (i.Username == username) { dB.EditUser(i.IDUser, username, password, i.TypeUserIDType); return(true); } } return(false); }