Running out of threads in threadpool

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C#

.NET

threads

I have an application that acts as an intermideate. It takes data from multiple machines and fowards to client machine through sockets. Every time the data is received new thread is created and data is sent to client.At one point available threads in pool becomes zero and application stops working.I even tried using ThreadPool.QueueUserWorkItem.

This is the function where new thread is created.

public void SendFeed(string data, string Key)
{
    Datadelegate _ProcessData = new Datadelegate(ProcessData);
    Form1.countEQ = Form1.countEQ + 1;
    TCPListenerForm.DataClass sObj = new TCPListenerForm.DataClass();
    sObj.DataByte = data;
    sObj.Key = Key;
    try
    {
        _ProcessData.BeginInvoke(sObj, completedCallback, null);
    }
    catch (Exception ex)
    {
    }
}