public MainWindow()
{
InitializeComponent();
tableDatas = new List <string>();
tableDatas.Add("form");
tableDatas.Add("question");
tableDatas.Add("question_option");
UpdateTableData.ItemsSource = tableDatas;
DeleteTableData.ItemsSource = tableDatas;
formdata = new FormDAO();
questiondata = new QuestionDAO();
questionOptiondata = new QuestionOptionDAO();
resultdata = new ResultDAO();
usersdata = new UsersDAO();
MySqlConnection connection = MyMySQLConnection.ConnectionSingleton();
connection.Open();
formColumnNames = formdata.FindColumnNamesOnlyString(connection);
questionColumnNames = questiondata.FindColumnNamesOnlyString(connection);
questionOptionColumnNames = questionOptiondata.FindColumnNamesOnlyString(connection);
resultColumnNames = resultdata.FindColumnNamesOnlyString(connection);
connection.Close();
}