public Query( ConnectionHandler con)
{
this.con = con;
this.con.openConnection(this.con.currentconnection);
this.cmd = new MySqlCommand();
}
virtual protected void button1_Click(object sender, EventArgs e)
{
DisplayGrid.Columns.Clear();
con = new ConnectionHandler();
Query quer = new Query(con);
if (ColumnsList.CheckedItems.Count > 0) {
List<List<string>> lis = quer.Select(TableComboBox.SelectedItem.ToString(), concatCheckedItems(), getCheckedItems());
FillDataGridView(lis);
}
else { MessageBox.Show("Seleziona degli elementi"); }
}