BernieApp.UWP.App.SetWindowSize C# (CSharp) Method

        public void SetWindowSize()
        {
            ApplicationView.PreferredLaunchViewSize = new Windows.Foundation.Size { Width = 600, Height = 800 };
            ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;
        }
    }