public static bool CheckLogin(string _username, string _password)
        {
            try
            {
                string query = $"SELECT count(*), gebruikerid, gen_length FROM gebruiker WHERE username = '{_username}' AND password = '{_password}' GROUP BY gebruikerid, gen_length";
                DataRowCollection data = Database.getData(query);
                if (Convert.ToInt32(data[0][0]) >= 1)
                {
                    Datas.Clear();

                    User loggedInUser = new User(
                        _username,
                        _password,
                        DateTime.Now,
                        Convert.ToInt32(data[0][1]),
                        Convert.ToInt32(data[0][2])
                    );
                    CurrentLoggedInUser = loggedInUser;

                    string qry2 = $"SELECT * FROM gegevens WHERE gebruiker_fk = {CurrentLoggedInUser.ID}";
                    DataRowCollection dataRows = Database.getData(qry2);
                    foreach (System.Data.DataRow item in dataRows)
                    {
                         DataRow newRow = new DataRow(
                            item.Field<String>("domain"),
                            item.Field<String>("username"),
                            item.Field<String>("password"),
                            item.Field<DateTime>("dateCreated"),
                            item.Field<Int32>("iddata")
                        );
                        Datas.Add(newRow);
                    }
                    return true;
                }else
                    return false;
            }
            #region Exceptions
            catch (System.Data.SqlClient.SqlException SE)
            {
                return BadExceptionHandler(SE.Message);
            }
            catch (InvalidOperationException IOE)
            {
                return BadExceptionHandler(IOE.Message);
            }
            catch (IndexOutOfRangeException IORE)
            {
                return BadExceptionHandler(/*IORE+*/"No User found for those login credentials\nPlease try again!\nLog in Failed");
            }
            #endregion
        }