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

I maked a taskbar class from this code like this:

public class Taskbar
{
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr FindWindow(string strClassName, string strWindowName);
[DllImport("shell32.dll")]
public static extern UInt32 SHAppBarMessage(UInt32 dwMessage, ref APPBARDATA pData);
public enum AppBarMessages
{
    New = 0x00,
    Remove = 0x01,
    QueryPos = 0x02,
    SetPos = 0x03,
    GetState = 0x04,
    GetTaskBarPos = 0x05,
    Activate = 0x06,
    GetAutoHideBar = 0x07,
    SetAutoHideBar = 0x08,
    WindowPosChanged = 0x09,
    SetState = 0x0a
}
[StructLayout(LayoutKind.Sequential)]
public struct APPBARDATA
{
    public UInt32 cbSize;
    public IntPtr hWnd;
    public UInt32 uCallbackMessage;
    public UInt32 uEdge;
    public Rectangle rc;
    public Int32 lParam;
}
public enum AppBarStates
{
    AutoHide = 0x01,
    AlwaysOnTop = 0x02
}
/// 

/// Set the Taskbar State option
/// 
/// AppBarState to activate
public void SetTaskbarState(AppBarStates option)
{
    APPBARDATA msgData = new APPBARDATA();
    msgData.cbSize = (UInt32)Marshal.SizeOf(msgData);
    msgData.hWnd = FindWindow("System_TrayWnd", null);
    msgData.lParam = (Int32)(option);
    SHAppBarMessage((UInt32)AppBarMessages.SetState, ref msgData);
}
/// 

/// Gets the current Taskbar state
/// 
/// current Taskbar state
public AppBarStates GetTaskbarState()
{
    APPBARDATA msgData = new APPBARDATA();
    msgData.cbSize = (UInt32)Marshal.SizeOf(msgData);
    msgData.hWnd = FindWindow("System_TrayWnd", null);
    return (AppBarStates)SHAppBarMessage((UInt32)AppBarMessages.GetState, ref msgData);
}
}

The problem is, when I'm performing

taskbar.SetTaskbarState(Taskbar.AppBarStates.AlwaysOnTop);

after

taskbar.SetTaskbarState(Taskbar.AppBarStates.AutoHide);

My start button is no more activated (i can't open the startmenu, clicking on it dosen't causes everything). I'm using Windows 10. Does anyone know a solution about that?