/// <summary>
    /// Compares strings ignoring case and culture
    /// </summary>
    public class IgnoreCaseEqualityComparer : IEqualityComparer<string>
    {
        #region Members

        private const int _multiplier = 89;

        #endregion

        #region IEqualityComparer Implementation

        public bool Equals(string x, string y)
        {
            if (x == null || y == null)
                return false;

            return x.Equals(y, StringComparison.InvariantCultureIgnoreCase);
        }

        public int GetHashCode(string obj)
        {
            int hashCode = 0;

            // Fault value for empty strings
            if (String.IsNullOrEmpty(obj))
                return hashCode;

            // Get length to determine first and last chars
            char firstLetter = obj.First();
            char lastLetter = obj.Last();

            // Compute hash code from two characters
            int part1 = firstLetter + obj.Length;
            hashCode = (_multiplier * part1) + lastLetter + obj.Length;

            return hashCode;
        }

        #endregion
    }