C#连接串口和控件随窗体扩大的方法

 
连接串口的方法
private delegate void HandleCommData_Delegate(string commdata);
        public void show(string str)
        {
            this.txt_myweight.Text = str;
        }

        private void OnDataReceived(object sender, SerialDataReceivedEventArgs e)
        {

            try
            {
                this.strdata = ConfigurationManager.AppSettings["startdata"];


                int bytes = comm.BytesToRead;

                byte[] buffer = new byte[bytes];
                comm.Read(buffer, 0, bytes);
                string str = Encoding.ASCII.GetString(buffer);
                if (str.Contains(startdata))
                {
                    strdata = "";
                    ifstart = 1;
                }
                if (ifstart == 1)
                {
                    if (str.Contains("g"))
                    {