SidebarDiagnostics.Windows.AppBarWindow.SetWindowLong C# (CSharp) Method

        private void SetWindowLong(long? add, long? remove)
        {
            IntPtr _hwnd = new WindowInteropHelper(this).Handle;

            bool _32bit = IntPtr.Size == 4;

            long _style;

            if (_32bit)
            {
                _style = NativeMethods.GetWindowLong(_hwnd, WND_STYLE.GWL_EXSTYLE);
            }
            else
            {
                _style = NativeMethods.GetWindowLongPtr(_hwnd, WND_STYLE.GWL_EXSTYLE);
            }

            if (add.HasValue)
            {
                _style |= add.Value;
            }

            if (remove.HasValue)
            {
                _style &= ~remove.Value;
            }

            if (_32bit)
            {
                NativeMethods.SetWindowLong(_hwnd, WND_STYLE.GWL_EXSTYLE, _style);
            }
            else
            {
                NativeMethods.SetWindowLongPtr(_hwnd, WND_STYLE.GWL_EXSTYLE, _style);
            }
        }