public FrmStatistiky()
{
InitializeComponent();
knihy = new List <Kniha>();
sqlRepository = new SqlRepository("Data Source=titanic.vassboskovice.cz;Initial Catalog=Hla_knihovna_2021;User ID=sa;Password=Agent007;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False");
}