How to set the timeout for a TcpClient?

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You would need to use the async BeginConnect method of TcpClient instead of attempting to connect synchronously, which is what the constructor does. Something like this:

var client = new TcpClient();
var result = client.BeginConnect("remotehost", this.Port, null, null);

var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromSeconds(1));

if (!success)
{
    throw new Exception("Failed to connect.");
}

// we have connected
client.EndConnect(result);

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