Trigger Pixel Change on Screen and do something

Hi @ all

GetColor allows me to retrieve the color of any pixel on the screen

Now i attempt to solve out how to trigger an action whenever the pixel color of X,Y-coordinates anywhere on screen changes. This should stop the methode RunApp() and start again.

Thanks in advance!

public Color GetColor(int x, int y)
{
	Bitmap b = new Bitmap(1, 1);
	Graphics g = Graphics.FromImage(b);
	g.CopyFromScreen(x, y, 0, 0, b.Size);
	g.Dispose();
	Color c = b.GetPixel(0, 0);
	b.Dispose();
 
	return c;
}
public void RunApp()
{	
	if (comboBoxPlatzAmTisch.Text == "")
	{
			MessageBox.Show("Geben Sie Ihren Platz am Tisch an!");
	}
	else
	{
		Color sResult = GetColor(iKartenPositionen[i, 0], iKartenPositionen[i, 1]);
		sResult = KarteVorhanden();
		if (sResult == true)	
		{
			ScreenshotSpieler(iSpielerPlatz);			
			bool fAktiv = GetPixelColor();
			if (fAktiv == true){
				//here follows more nested if statements}
		}
		else
		{
			Pockal.Clear();
			Tisch.Clear();
			Gegner.SelectedIndex = 0;
		}
	}	
}

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