There is no need for a third party DLL. This simple method captures the current screen image into a .NET Bitmap object.
private Image CaptureScreen()
{
Rectangle screenSize = Screen.PrimaryScreen.Bounds;
Bitmap target = new Bitmap(screenSize.Width,screenSize.Height);
using(Graphics g = Graphics.FromImage(target))
{
g.CopyFromScreen(0,0,0,0,new Size(screenSize.Width,screenSize.Height));
}
return target;
}
I am sure you can figure out how to capture a smaller portion of the screen, if that is needed :-).