当远程端点没有连接c#时，TCP可能会失败

使用。net sockets。我正在尝试确定套接字是否连接。如果远程端点没有连接，我希望发送操作失败。实际上，我不会在发送上得到异常，但是发送成功通过后，一段时间后发送将失败。对此有什么解释吗?我还能做些什么来获得连接状态?

我的代码很简单基于此'

Int32 port = 13000;
TcpClient client = new TcpClient(server, port);
// Translate the passed message into ASCII and store it as a Byte array.
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);         
// Get a client stream for reading and writing.

//Stream = client.GetStream();

NetworkStream stream = client.GetStream();
// Send the message to the connected TcpServer. 
stream.Write(data, 0, data.Length);
Console.WriteLine("Sent: {0}", message);         
// Receive the TcpServer.response.
// Buffer to store the response bytes.
data = new Byte[256];
// String to store the response ASCII representation.
String responseData = String.Empty;
// Read the first batch of the TcpServer response bytes.
Int32 bytes = stream.Read(data, 0, data.Length);
responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.WriteLine("Received: {0}", responseData);         
// Close everything.
client.Close();    `