How to toggle/switch Windows taskbar from “show” to “auto-hide” (and vice-versa)?

Question

Basically I want to make simple toggle program (that will be mapped to some keyboard shortcut) that set taskbar to auto-hide mode if in normal mode (and conversely, to normal sh

Answer 1

For all those who arrived here from Google and are using Windows 10, like me, the answers from @Quispie and @nicruo are OK but need an extra if.

The reason for that is the class name differs from version to version (apparently, as I no longer have any other Windows but 10).

msgData.hWnd = FindWindow("System_TrayWnd", null);
if (msgData.hWnd == IntPtr.Zero)
    msgData.hWnd = FindWindow("Shell_TrayWnd", null);