c#实时获取当前网络状态（转）

http://netcc.blogspot.com/2007/05/ccadsl.html
使用ping命令来判断,txtIP文本框输入一个有效的远程主机ip
System.Diagnostics.Process proIP=new System.Diagnostics.Process();
proIP.StartInfo.FileName="cmd.exe";
proIP.StartInfo.UseShellExecute = false;
proIP.StartInfo.RedirectStandardInput = true;
proIP.StartInfo.RedirectStandardOutput = true;
proIP.StartInfo.RedirectStandardError = true;
proIP.StartInfo.CreateNoWindow = true;//不显示cmd窗口
proIP.Start();
proIP.StandardInput.WriteLine("ping "+this.txtIP.Text.Trim());
proIP.StandardInput.WriteLine("exit");
string strResult=proIP.StandardOutput.ReadToEnd();
if(strResult.IndexOf("(0% loss)")!=-1)
this.txtShow.Text="Ping 通了！";
else if(strResult.IndexOf("(100% loss)")!=-1)
this.txtShow.Text="无法 Ping 通！";
else
this.txtShow.Text="数据有丢失！";
proIP.Close();