简单的c#程序

Question

请问这个程序错在哪里？？using System;
namespace p3_4
{
    public class jiekou
    {
        public static void Main()
        {
            contact c = new contact();
            telphone t = new telphone();
            c.name = "李明";
            c.age = 32;
            c.tel = "2343423";
            t = c;
            t.dialnumber();
        }
    }
  interface telphone
    {
       void dialnumber();    }
    public class contact:telphone 
    {
        public string name;
        public int age;
        public string tel;        public void dialnumber()
        {
            Console WriteLine("start dialing...");
            Console WriteLine(t.tel);
            Console WriteLine("connected");
            Console ReadLine();
            Console WriteLine("disconnected.");
        }    }
}

Answer 1

telphone t = new telphone();

Answer 2

从没听说过接口是可以NEW的....