DllImport Format?

Hi guys,

Why does "[DllImport("user32.dll")] " have to be used every time an external method is added?

For example, the code looks like this:

[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

instead of this:

[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

Thanks

Richard