如何实现C#判断连网状态

怎么实现C#判断连网状态

C# code

[DllImport("wininet")]        private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

C# code

int i = 0;if (InternetGetConnectedState(out i, 0)){    MessageBox.Show("联网状态");}else{    MessageBox.Show("你网线掉了啦");}