public List <List <string> > ClientsInfo()
{
List <List <string> > res = new List <List <string> >();
var reader_n = doQuery.Start(SqlQueries.ClientsNames());
var reader_p = doQuery.Start(SqlQueries.ClientsPhones());
var reader_i = doQuery.Start(SqlQueries.ClientsDiscount());
var reader_e = doQuery.Start(SqlQueries.ClientsExtraData());
res.Add(reader_n.GetListOfString(0));
res.Add(reader_p.GetListOfString(0));
res.Add(reader_i.GetListOfString(0));
res.Add(reader_e.GetListOfString(0));
return(res);
}