using System.Reflection;

...

        public static string GetPropertyValue<T>(this T @this,
                string propertyToRead) where T : class
        {
            string propertyValue = string.Empty;
            var sourceType = @this.GetType();
            var binding = BindingFlags.Public | BindingFlags.Instance;

            if (propertyToRead.Contains("."))
            {
                var property = sourceType.GetProperty(
                                propertyToRead.Split('.').First(),
                                binding | BindingFlags.GetProperty);
                var value = property.GetValue(@this, null);
                propertyValue = value.GetPropertyValue(String.Join(".", propertyToRead.Split('.').Skip(1).ToArray()));
            }
            else
            {
                propertyValue = Convert.ToString(@this.GetType().GetProperty(propertyToRead).GetValue(@this, null));
            }
            return propertyValue;
        }