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try
{
string hostAddress = "192.168.1.1"; //ip地址
int conPort = "80"; //端口
IPEndPoint hostEndPoint = new IPEndPoint(hostAddress, conPort);
Socket st = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
st.Connect(hostEndPoint);
if (!st.Connected)
{//发短信
}
}
catch(Exception ex)
{
//发短信
}