udp server

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C#

Visual-Studio

Hello every one ,
Guys I just built a simple udp server and that's the code :

private void Form1_Load(object sender, EventArgs e)
        {
            Thread thdUDPServer = new Thread(new
ThreadStart(serverThread));
            thdUDPServer.Start();
        }

        public void serverThread()
{
UdpClient udpClient = new UdpClient(8080);
while(true)
{
    IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
    Byte[] receiveBytes = udpClient.Receive(ref
RemoteIpEndPoint);
    string returnData = Encoding.ASCII.GetString(receiveBytes);
    lbConnections.Items.Add(
    RemoteIpEndPoint.Address.ToString() + ":" +
    returnData.ToString()
    );
}
}
    }
}

But every time when i run the program the following error appears:

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

so please help me