private void 채팅창비우기ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     Rtxtb_Chat_Log.Clear();
 }
        private bool Connect()
        {
            Pic_StatusIcon.Image = SimpleChatClient.Properties.Resources.yellow_button_clip_md;

            if (txtb_Server_IP.Text != "")
            {
                if (txtb_Server_Port.Text != "")
                {
                    try
                    {
                        int TargetPort = Convert.ToInt16(this.txtb_Server_Port.Text);

                        TargetServer = new TcpClient(this.txtb_Server_IP.Text, TargetPort); //

                        // recvThread는 함수 RecvThread를 갖는 새로운 쓰레드로서 생성한뒤 실행한다.
                        recvThread = new Thread(new ThreadStart(recvFunc));
                        recvThread.Start();

                        ConnStatusFindThread = new Thread(new ThreadStart(ConnStatusFind_Func));
                        ConnStatusFindThread.Start();

                        this.isRunning              = true;
                        this.btn_Connect.Enabled    = false;
                        this.btn_DisConnect.Enabled = true;
                        this.btn_Send_Msg.Enabled   = true;
                        txtb_Server_IP.ReadOnly     = true;
                        txtb_Server_Port.ReadOnly   = true;
                        txtb_Chat_Box.Enabled       = true;
                        btn_Send_Msg.Enabled        = true;

                        txtb_Chat_Box.Focus();

                        Pic_StatusIcon.Image = SimpleChatClient.Properties.Resources.greenbutton_hi;

                        txtb_Chat_Box.Clear();
                        Rtxtb_Chat_Log.Clear();

                        Rtxtb_Chat_Log.Invoke(new WriteChatLog(WriteLog), "서버와 연결되었습니다.");

                        return(true);
                    }
                    catch
                    {
                        MessageBox.Show("서버에 연결할 수 없습니다.", "접속 오류", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        txtb_Server_IP.Focus();
                        Pic_StatusIcon.Image = SimpleChatClient.Properties.Resources.redbutton_hi;
                        return(false);
                    }
                }
                else
                {
                    MessageBox.Show("포트 번호를 입력해주십시오.", "입력 오류", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    txtb_Server_Port.Focus();
                    Pic_StatusIcon.Image = SimpleChatClient.Properties.Resources.redbutton_hi;
                    return(false);
                }
            }
            else
            {
                MessageBox.Show("서버의 IP주소를 입력해주십시오.", "입력 오류", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtb_Server_IP.Focus();
                Pic_StatusIcon.Image = SimpleChatClient.Properties.Resources.redbutton_hi;
                return(false);
            }
        }