internal static class SomeClassExtentions
    {
        public static String GetSomeValue(this Object classInstance, String fieldName)
        {
            const BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
            Type ft = classInstance.GetType();
            Object value = classInstance;

            foreach (String field in fieldName.Split('.'))
            {
                FieldInfo fi = ft.GetField(field, flags);
                if (fi != null)
                {
                    value = fi.GetValue(value);
                    ft = fi.FieldType;
                }
            }
            return value != null ? value.ToString() : String.Empty;
        }
    }