public Main()
{
InitializeComponent();
defaultContext = new DefaultContext();
List <String> tableNames = defaultContext.GetScheme();
import = new Import(defaultContext, tables_cb, tableNames);
export = new Export(defaultContext, tables_cb_e, tableNames);
marker = new Watermark(defaultContext);
export_bt.Enabled = true;
delete_pb.Visible = false;
delete_pb.Minimum = 1;
delete_pb.Maximum = 11;
delete_pb.Value = 1;
delete_pb.Step = 1;
}