添加串口到web页面

是否可以在web应用程序中添加串行端口控制?我试过以编程方式创建一个，但我有端口保持开放的问题。我不知道如何解决这个问题，除了通过添加一个串口控制以某种方式到网页。关于如何完成这项任务，你有什么建议吗?提前谢谢。

下面是我目前拥有的代码:

public partial class LoadCellTest : System.Web.UI.Page
{ 
SerialPort serialPort1 = new SerialPort("COM3",9600,Parity.None,8,StopBits.One);
 protected void Page_Load(object sender, EventArgs e)
{
    serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
    serialPort1.ErrorReceived += new SerialErrorReceivedEventHandler(serialPort1_ErrorReceived);
}
delegate void SerialDataReceivedDelegate(object sender, SerialDataReceivedEventArgs e);
delegate void SerialErrorReceivedDelegate(object sender, SerialErrorReceivedEventArgs e);

protected void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
   TextBox1.Text = (serialPort1.ReadExisting());
   if (serialPort1.ReadExisting().Length == 0)
   {
       ListBox1.Items.Insert(0, TextBox1.Text);
       TextBox1.Text = "";
   }
}
protected void button1_Click(object sender, EventArgs e)
{
    try
    {
        if (serialPort1.IsOpen)
        {
            serialPort1.Close();
            button1.Text = "Start";
        }
        else
        {
            serialPort1.Open();
            button1.Text = "Stop";
        }
    }
    catch (IOException ex)
    {
        MessageBox.Show(ex.Message);
    }
}