Converts an IEnumerable list to a comma separated list of string

IEnumerable.ToStringList.cs

        /// <summary> 
        /// Prints the collection as a comma separated string
        /// </summary>
        public static string ToStringList<T>(this IEnumerable<T> list)
        {
            if (list == null) return String.Empty;
            var sb = new StringBuilder();
            foreach (var elem in list)
            {
                if (elem == null) continue;
                sb.Append(elem.ToString());
                sb.Append(", ");
            }
            if (sb.Length >2) sb.Remove(sb.Length - 2, 2);
            return sb.ToString();
        }