gistfile1.cs

// Sample code to remember size and location of a WinForm.
// Needs a Settings class called FormSettings.
protected override void OnLoad(EventArgs e)
{
  base.OnLoad(e);
  Point location = FormSettings.Default.Location;
  if (!StartPositionIsWithinBounds(location))
  {
    location.X = 10;
    location.Y = 10;
  }
  Location = location;
  Size = FormSettings.Default.Size;
}

private static bool StartPositionIsWithinBounds(Point startPosition)
{
  foreach (Screen screen in Screen.AllScreens)
  {
    if (screen.Bounds.Contains(startPosition))
    {
      return true;
    }
  }
  return false;
}

protected override void OnClosed(EventArgs e)
{
  base.OnClosed(e);
  FormSettings.Default.Location = Location;
  FormSettings.Default.Size = Size;
  FormSettings.Default.Save();
}