How to show/Hide Navigation Drawer programmatically

Question

How can I use button to show/hide Navigation Drawer, I have used this SO link to create and manage Navigation Drawer.

Now i am using (Swipe to right from left - to show)

Answer 1

to Close Drawer:

drawer.CloseDrawer((int)GravityFlags.Left);

to Open Drawer:

drawer.OpenDrawer((int)GravityFlags.Left);