private void ShowClients(bool genre)
        {
            if (fpnClients.Controls.Count > 0)
            {
                fpnClients.Controls.Clear();
            }
            List <Client> c;

            if (genre == true)
            {
                c = new ClientBLL().RetrieveByGenre(1);
            }
            else
            {
                c = new ClientBLL().RetrieveByGenre(2);
            }

            ClientsPanel[] clients = new ClientsPanel[c.Count];
            for (int i = 0; i < clients.Length; i++)
            {
                clients[i] = new ClientsPanel(table.Size.Width, table.Size.Height)
                {
                    ID        = c[i].ID,
                    FirstName = c[i].FirstName,
                    LastName  = c[i].LastName,
                    UserName  = c[i].UserName,
                    Password  = c[i].Password,
                    Gender    = c[i].Gender.Name,
                    Birthday  = c[i].Birthday.ToString("dd-MM-yyyy")
                };
                fpnClients.Controls.Add(clients[i]);
            }
        }
        private void ShowClients(string filter)
        {
            if (fpnClients.Controls.Count > 0)
            {
                fpnClients.Controls.Clear();
            }
            var           all = new ClientBLL().RetrieveALL();
            List <Client> c   = new List <Client>();

            foreach (var item in all)
            {
                if (System.Text.RegularExpressions.Regex.IsMatch(item.UserName, filter))
                {
                    c.Add(item);
                }
            }
            all = c;

            ClientsPanel[] clients = new ClientsPanel[c.Count];
            for (int i = 0; i < clients.Length; i++)
            {
                clients[i] = new ClientsPanel(table.Size.Width, table.Size.Height)
                {
                    ID        = all[i].ID,
                    FirstName = all[i].FirstName,
                    LastName  = all[i].LastName,
                    UserName  = all[i].UserName,
                    Password  = all[i].Password,
                    Gender    = all[i].Gender.Name,
                    Birthday  = all[i].Birthday.ToString("dd-MM-yyyy")
                };
                fpnClients.Controls.Add(clients[i]);
            }
        }