unable to set the serial port state

[Void-Overflow]

Hi I'm using the Arduino Sketch Uploader to upload some code to my arduino. I have set everything like the com port and fiile, and it gets through that part without any exception. Only, when I connect my arduino through usb and click my upload button, the entire form freezes until I disconnect my arduino. Afterwards it gives me the error "unable to set the serial port state" below you will find my code -

private void button2_Click(object sender, EventArgs e) { button2.Text = "Uploading..."; foreach (string s in checkedListBox1.CheckedItems) { if (s == "Arduino Nano R3 (Recommended )") { model = ArduinoModel.NanoR3; }

            `else if (s == "Arduino Nano R2")
            {
                model = ArduinoModel.NanoR2;
            }

            else if (s == "Arduino Mega")
            {
                model = ArduinoModel.Mega2560;
            }

            else if (s == "Arduino Micro")
            {
                model = ArduinoModel.Micro;
            }

            else if (s == "Arduino Uno")
            {
                model = ArduinoModel.UnoR3;
            }

            else
            {
                model = ArduinoModel.NanoR3;
            }
        }

        foreach (string s in checkedListBox2.CheckedItems)
        {
            port = s;
        }

        var uploader = new ArduinoSketchUploader(
          new ArduinoSketchUploaderOptions()
          {
              FileName = @file,
              PortName = port,
              ArduinoModel = model
          });

        try
        {
            uploader.UploadSketch();
        }
        catch (Exception ex)
        {
            errs = ex.Message;
        }

        msg = (string)( "Uploading: " + file + ";" + model + ";" + port);

        if (errs.Length > 0)
        {
            label12.Text = errs;
            label12.BackColor = Color.Red;
            button2.Text = "Failed";
        }
        else
        {
            label12.Text = msg;
            label12.BackColor = Color.YellowGreen;
            button2.Text = "Uploaded";
        }
        
    }`