System.Net.Sockets。SocketeException:一个无效的参数提供错误代码:10022。

private void btnStart_Click(object sender, EventArgs e)
        {

 try
            {
                epLocal = new IPEndPoint(IPAddress.Parse(txtIP1.Text), Convert.ToInt32(txtPort1.Text));
                sck.Bind(epLocal);
                epRemote = new IPEndPoint(IPAddress.Parse(txtIP2.Text), Convert.ToInt32(txtPort2.Text));
              //Here Error Occures I dont know what is my mistake?
                sck.Bind(epRemote);
                byte[] buffer = new byte[1500];
                sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);
                btnStart.Text = "Connected";
                btnStart.Enabled = false;
                btnSend.Enabled = true;
                txtMessage.Focus();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
private void btnStart_Click(object sender, Even