public static IContentBuilder Name(this IContentBuilder @this, string name)
        {
            var last = @this.Last();

            last.Headers.ContentDisposition.Name = name;

            return(@this);
        }
        public static IContentBuilder File(this IContentBuilder @this, string fileName)
        {
            var last = @this.Last();

            fileName = Path.GetFileName(fileName);

            last.Headers.ContentDisposition.FileName     = fileName;
            last.Headers.ContentDisposition.FileNameStar = fileName;

            return(@this);
        }