private IKeyboardMouseEvents globalHook = Hook.GlobalEvents();
private bool IsLeftMouseDown;
private bool IsRightMouseDown;

private void Subscribe()
{
   globalHook.MouseDownExt += GlobalHook_MouseDownExt;
   globalHook.MouseUpExt += GlobalHook_MouseUpExt;
}

private void UnSubscribe()
{
   globalHook.MouseDownExt -= GlobalHook_MouseDownExt;
   globalHook.MouseUpExt -= GlobalHook_MouseUpExt;
   
   globalHook.Dispose();
}

private void GlobalHook_MouseDownExt(object? sender, MouseEventExtArgs e)
{
   switch (e.Button)
   {
   	case MouseButtons.Left: if (!e.IsInjected) IsLeftMouseDown = true; break;
   	case MouseButtons.Right: if (!e.IsInjected) IsRightMouseDown = true; break;
   }
   
   if(IsLeftMouseDown)
   {
   	_ = FastClick();
   }
}

private void GlobalHook_MouseUpExt(object? sender, MouseEventExtArgs e)
{
   switch (e.Button)
   {
   	case MouseButtons.Left: if (!e.IsInjected) IsLeftMouseDown = false; break;
   	case MouseButtons.Right: if (!e.IsInjected) IsRightMouseDown = false; break;
   }
}

private async Task FastClick()
{
   await Task.Run(() =>
   {
   	while(IsLeftMouseDown)
   	{
   		//Send left mouse click code here
   		Thread.Sleep(100);
   	}
   });
}

private IKeyboardMouseEvents m_GlobalHook;

public void Subscribe()
{
    // Note: for the application hook, use the Hook.AppEvents() instead
    m_GlobalHook = Hook.GlobalEvents();

    m_GlobalHook.MouseDownExt += GlobalHookMouseDownExt;
    m_GlobalHook.KeyPress += GlobalHookKeyPress;
}

private void GlobalHookKeyPress(object sender, KeyPressEventArgs e)
{
    Console.WriteLine("KeyPress: \t{0}", e.KeyChar);
}

private void GlobalHookMouseDownExt(object sender, MouseEventExtArgs e)
{
    Console.WriteLine("MouseDown: \t{0}; \t System Timestamp: \t{1}", e.Button, e.Timestamp);

    // uncommenting the following line will suppress the middle mouse button click
    // if (e.Buttons == MouseButtons.Middle) { e.Handled = true; }
}

public void Unsubscribe()
{
    m_GlobalHook.MouseDownExt -= GlobalHookMouseDownExt;
    m_GlobalHook.KeyPress -= GlobalHookKeyPress;

    //It is recommened to dispose it
    m_GlobalHook.Dispose();
}