Display html file content in a webrowser locally

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C#

XAML

Windows-Phone-7

Hi The code below supposed to display html file content in a webrowser locally according to
present day i.e if the user open the app on 25/2/2016 the app should open devotion56.html which is the
56th day of the year. I have all 366 html files in a folder (Devotion). But when i test the app in a device
it does not load the content but shows error page on the browser
See my code below

namespace HtmlWebViewLocally
{
public partial class PivotHtmlLocally : PhoneApplicationPage
{
public PivotHtmlLocally()
{
InitializeComponent();

var dttimne = DateTime.Now;
string date = dttimne.Day.ToString();
string month = dttimne.Month.ToString();
string year = dttimne.Year.ToString();
string htmlfilename = date + "_" + month + "_" + year;
string FinalHtmlName = "Devotion/" + htmlfilename + ".html";

SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape;
//This is the navigate uri of all the 366 html files of each day
webBrowser1.Navigate(new Uri("Devotion/devotion1.html", UriKind.Relative));
webBrowser1.Navigate(new Uri("Devotion/devotion2.html", UriKind.Relative));
webBrowser1.Navigate(new Uri("Devotion/devotion3.html", UriKind.Relative));
webBrowser1.Navigate(new Uri("Devotion/devotion4.html", UriKind.Relative));
webBrowser1.Navigate(new Uri("Devotion/devotion5.html", UriKind.Relative));
Kindly help

What I have tried:

I have tried asking on windows phone forum but not clear with the answer given