public static void Close()
{
if (StockDB.dtSymbolListChanged)
{
StockDB.SaveDB(StockDB.dtSymbolList);
}
if (StockDB.dtFolderAllChanged)
{
StockDB.SaveDB(StockDB.dtFolderAll);
}
if (StockDB.dtFolderRelChanged)
{
StockDB.SaveDB(StockDB.dtFolderRel);
}
}