Serenity.UploadHelper.HasImageExtension C# (CSharp) Method

        public static bool HasImageExtension(string filename)
        {
            if (filename == null)
                return false;

            filename = filename.ToLower();

            return
                filename.EndsWith(".jpg") ||
                filename.EndsWith(".jpeg") ||
                filename.EndsWith(".gif") ||
                filename.EndsWith(".png");
        }