Page navigation helpers Metro

PageBase.cs

public class PageBase : LayoutAwarePage
{
        protected override void OnNavigatedTo(Windows.UI.Xaml.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            object obj = null;
            Debug.Assert(e.Parameter == null || e.Parameter is String, "Expected string as parameter");
            if (e.Parameter != null) obj = SerializationHelper.DataContractDeserialize<object>((string) e.Parameter);
            OnNavigatedToSmart(e, obj);
        }

        /// <summary>
        /// Triggered after OnNavigatedTo, where parameter is deserialized for you
        /// </summary>
        /// <param name="e"></param>
        /// <param name="parameter"></param>
        protected virtual void OnNavigatedToSmart(Windows.UI.Xaml.Navigation.NavigationEventArgs e, object parameter) { }

        /// <summary>
        /// Navigates to the page specified and serializes argument if any
        /// </summary>
        /// <param name="pageType"></param>
        /// <param name="argument">Serializable argument object or null</param>
        protected void NavigateToSmart(Type pageType, IMobileObject argument = null)
        {
            string argAsString = null;
            if (argument != null) argAsString =  SerializationHelper.DataContractSerialize(argument);
            Frame.Navigate(pageType, argAsString);
        }
}

SerializationHelper.cs

public class SerializationHelper
{
        public static string DataContractSerialize(object obj)
        {
            using (var tempStream = new MemoryStream())
            {
                DataContractSerializer serializer = new DataContractSerializer(obj.GetType());
                serializer.WriteObject(tempStream, obj);
                tempStream.Seek(0, SeekOrigin.Begin);
                StreamReader sr = new StreamReader(tempStream);
                string objAsString = sr.ReadToEnd();
                return objAsString;
            }
        }

        public static T DataContractDeserialize<T>(string s)
        {
            var serializer = new DataContractSerializer(typeof(T));
            using (var tempStream = new MemoryStream())
            {
                var sr = new StreamWriter(tempStream);
                sr.Write(s);
                sr.Flush();
                tempStream.Seek(0, SeekOrigin.Begin);
                return (T) serializer.ReadObject(tempStream);
            }            
        }
}