ControlzEx.Microsoft.Windows.Shell.WindowChrome._NonClientFrameEdgesAreValid C# (CSharp) Method

        private static bool _NonClientFrameEdgesAreValid(object value)
        {
            NonClientFrameEdges ncEdges = NonClientFrameEdges.None;
            try
            {
                ncEdges = (NonClientFrameEdges)value;
            }
            catch (InvalidCastException)
            {
                return false;
            }

            if (ncEdges == NonClientFrameEdges.None)
            {
                return true;
            }

            // Does this only contain valid bits?
            if ((ncEdges | NonClientFrameEdges_All) != NonClientFrameEdges_All)
            {
                return false;
            }

            // It can't sacrifice all 4 edges.  Weird things happen.
            if (ncEdges == NonClientFrameEdges_All)
            {
                return false;
            }

            return true;
        }