C#, form Settings, serial communication serialplot

This answer quotes ChatGPT

First, based on the code and screenshots you provided, I found some syntax errors and logic problems in your code, which may cause the code to not compile or run. Here are some suggested changes to your code:

private void SearchAndAddSerialToComboBox(object sender, EventArgs e)
{
    string buffer;
    comboBox1.Items.Clear(); //清除之前已经扫描的记录
    for (int i = 1; i <= 20; i++) //修改循环范围和变量名
    {
        try
        {
            buffer = "COM" + i.ToString(); //获得COM1-20
            serialPort1.PortName = buffer; //设置串口的名称
            serialPort1.Open(); //串口
            comboBox1.Items.Add(buffer);
            comboBox1.Text = buffer; //添加串口名称到下拉框并选中
            serialPort1.Close(); //关闭串口
        }
        catch (Exception ex) //修改异常类型
        {
            //MessageBox.Show("串口有问题：" + ex.Message); //显示异常信息
        }
    }
}

Modification suggestions are as follows:

1. Change the variable name from "Buffer" to "buffer" and add braces at the beginning of the function.
2. Change the loop range from 1-20, and change the variable name from "i" to "index".
3. In the try block, set the serial port name to serialPort1.PortName, and open the serial port.
4. Add the serial port name to the Items collection in the drop-down list box and select the serial port name.
5. catch the exception in the Catch block and display the exception information.
6. Close the serial port at the end of the loop.