Detect when two keys are pressed at the same time

Question

I have no idea how do this.

I know only how do detect one key:

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys         


        

Answer 1

As you can see, you can use a timer event with boolean's to detect if two keys are pressed.

    bool keyup = false;
    bool keyleft = false;

    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            keyup = true;
        }
        else if (e.KeyCode == Keys.Left)
        {
            keyleft = true;
        }
    }

    private void Form1_KeyUp(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Up)
        {
            keyup = false;
        }
        else if (e.KeyCode == Keys.Left)
        {
            keyleft = false;
        }
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        timer1.Start();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        if (keyleft && keyup)
        {
            Console.Beep(234, 589);
        }
    }