Can a form tell if there are any modal windows open?

Question

How, being inside the main form of my WinForm app can I tell if there are any modal windows/dialogs open that belong to the main form?

Answer 1

Timers still run and fire events.
Example that works...

public partial class Form1 : Form
{
    Form2 f2 = new Form2();
    public Form1()
    {
        InitializeComponent();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        f2.UpdateData(DateTime.Now.ToString());
        if (!f2.Visible) f2.ShowDialog();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        f2.ShowDialog();
        MessageBox.Show("Done");
    }
}