Mærkelig fejl under runtime

Jeg får denne fejl under runtime, når en klient logger på min server

Cross-thread operation not valid: Control 'lbl_Clientsconn' accessed from a thread other than the thread it was created on.

I denne her metode

public void OnClientConnect(IAsyncResult asyn)
        {
            try
            {
                m_workerSocket[m_clientCount] = m_mainSocket.EndAccept(asyn);
                WaitForData(m_workerSocket[m_clientCount]);
                ++m_clientCount;
                m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);
                this.lbl_Clientsconn.Text = m_clientCount.ToString(); //Det er denne her linje der er problemer med
               
            }
            catch (ObjectDisposedException)
            {
                System.Diagnostics.Debugger.Log(0, "1", "\n OnClientConnection: Socket has been closed\n");
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
           
        }