问如何在固定时间内更改按钮的backColor？

EN

public formLabel()
{
    InitializeComponent();
    // ...
    timerColor.Tick += timerColor_Tick;
    timerColor.Interval = 3000;
}

private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    string indata = sp.ReadExisting();
    MessageBox.Show("Dati Ricevuti: " + indata);
    if (indata.CompareTo("K") == 0)
    {
        timerColor.Enabled = true;
        btnEsito.BackColor = Color.Green;
        btnEsito.Text = "GOOD";
        // Do something
    }
    if (indata.CompareTo("O") == 0)
    {
        timerColor.Enabled = true;
        btnEsito.BackColor = Color.Red;
        btnEsito.Text = "NO GOOD";
    }
}

private void timerColor_Tick(object sender, EventArgs e)
{
    MessageBox.Show("HERE!");
    timerColor.Enabled = false;
    btnEsito.BackColor = Color.White;
}