Compares two comma delimited strings in order to find at least one matching element (an element both strings contain)

Match at least one element from a comma delimited string with a second comma delimited string

 /// <summary>
        /// Compares two comma delimited strings in order to find at least one matching element
        /// </summary>
        /// <param name="sourceElements">The first comma delimited string</param>
        /// <param name="searchElements">The second comma delimited string</param>
        /// <returns>True if there is at least one match</returns>
        public static bool MatchesAtLeastOne(this string sourceElements, string searchElements)
        {
            if (string.IsNullOrEmpty(sourceElements) || string.IsNullOrEmpty(searchElements)) return false;

            bool retVal = false;

            var searchArray = searchElements.Split(new Char[] { ',' });
            var sourceArray = sourceElements.Split(new Char[] { ',' });

            foreach (var s in searchArray)
            {
                foreach (var st in sourceArray)
                {
                    if (st.Equals(s))
                    {
                        retVal = true;
                        break;
                    }
                }

            }
            return (retVal);
        }