ถามเรื่อง SQL, DataGridView + Ms SQL Server กับการแทนรหัสตัวเลข ครับผม

        public enum CasingInt : int
        {
            A = 1,
            B = 2,
            C = 3,
            D = 4,
            E = 5,
            F = 6,
            G = 7,
            H = 8,
            I = 9,
            J = 0
        }

        private string CasingIntToEncryptString(string source)
        {
            string result = "";
            char[] charArr = source.ToCharArray();
            foreach (char c in charArr)
            {
                foreach (int enumVal in System.Enum.GetValues(typeof(CasingInt)))
                {
                    if (string.Equals(enumVal.ToString(), c.ToString()))
                    {
                        result = result + System.Enum.GetName(typeof(CasingInt), enumVal);
                        break;
                    }
                }
            }
            return result;
        }