void amount() { try { Kustia_Trading_Agency_Management_BL kta_bl = new Kustia_Trading_Agency_Management_BL(); Kustia_Trading_Agency_Management_Entity information1 = new Kustia_Trading_Agency_Management_Entity(); information1.ship_name = comboBox1.Text; string n = kta_bl.amount(information1); amnt = float.Parse(n); label5.Text = "Available : " + amnt; // label5.Text = n; } catch (Exception ex) { Console.WriteLine(ex); } }