MainActivity.cs

        protected override void OnCreate(Bundle bundle)
        {
            //...

            //Add a header view to the NavigationView
            ConfigureNavigationViewHeader();
        }
        
        private void ConfigureNavigationViewHeader()
        {
            View viewHeader = LayoutInflater.Inflate(Resource.Layout.mainActivity_navigationView_header, null);

            ImageView imageviewUserAvatar = viewHeader.FindViewById<ImageView>(Resource.Id.mainActivity_navigationView_header_imageview_userAvatar);
            TextView textviewUserPseudo = viewHeader.FindViewById<TextView>(Resource.Id.mainActivity_navigationView_header_textview_UserPseudo);
            TextView textviewUserDesc = viewHeader.FindViewById<TextView>(Resource.Id.mainActivity_navigationView_header_textview_UserDesc);

            imageviewUserAvatar.SetImageResource(Resource.Drawable.photo_profil);
            textviewUserPseudo.Text = "Maxime Esprit";
            textviewUserDesc.Text = "A passionate mobile apps developer";
            
            m_navigationView.AddHeaderView(viewHeader);
        }