serial port - displaying empty results C# -

guys using following code displaying no output , not showing error. please help.

private void button1_click(object sender, eventargs e) {     string[] ports = serialport.getportnames();     //display each port name console.     foreach (string port in ports)     {         listbox1.items.add(port);         //_serialport.open();     } } 

using system; namespace listserial {     class program     {         public static void main(string[] args)         {             string[] names = null;             try             {                 names = system.io.ports.serialport.getportnames();             }             catch(exception ex)             {                 console.writeline(ex.message);             }             if(names!=null)             {                 int portnum = names.length;                 if (portnum != 0)                 {                     (int = 0; < names.length; i++)                         console.writeline(names[i]);                 }                 else                 {                     console.writeline("no_com");                 }             }         }     } }