Converts an ICollection of T to a comma separated list of strings

ICollection.ToString.cs

        /// <summary>
        /// Prints the collection as a comma separated string
        /// </summary>
        public static string ToStringList<T>(this ICollection<T> list)
        {
            var sb = new StringBuilder();
            int i = 0;
            foreach (var elem in list)
            {
                sb.Append(elem.ToString());
                if (i++ != list.Count - 1) sb.Append(", ");
            }
            return sb.ToString();
        }