gistfile1.cs

int startTickCount = Environment.TickCount;
int timeout = 10000;
var dataSent = false;
var socket = tcpClient.Client;

while (dataSent == false)
{
    if (Environment.TickCount > startTickCount + timeout)
    {
        throw new Exception("Timeout.");
    }

    try
    {
        socket.Send(data, 0, data.Length, SocketFlags.None);
        dataSent = true;
    }
    catch (SocketException e)
    {
        if (e.SocketErrorCode == SocketError.WouldBlock ||
            e.SocketErrorCode == SocketError.IOPending ||
            e.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
        {
            Thread.Sleep(30);
        }
        else
        {
            throw e;
        }
    }
}