Timers in Windows Phone 8

private void setTimer()

{

DispatcherTimer dt = new DispatcherTimer();

dt.Interval = TimeSpan.FromSeconds(5);

dt.Tick += delegate

{

if (index == 0)

homepageimage.Source = listOfImages[index];

else if (index < listOfImages.Count)

{

homepageimage.Source = listOfImages[index];

}

else

index = -1;

++index;

this.fadeIn.Begin();

};

dt.Start();

}

 

Their are a total of 5 images in listOfImages.But while displaying it shows  only 3 images.I have debugged the code and according to that it is  it should show all 5.I don't know why this code is not working as expected.