how to add index of item to a navigation page in wp7

Question

private void my_listbox_SelectionChanged(object sender, SelectionChangedEventArgs e)   
{            
    try
    {
        FrameworkElement element = (FrameworkElement)sender;
        SampleData item = (SampleData)element.DataContext;
        int index = dataSource.IndexOf(item);
        string s = "/Page"+index;
        s +=".xaml";
        NavigationService.Navigate(new Uri("s", UriKind.Relative));
    }
    catch
    {
        MessageBox.Show("Sorry..please try again..");
    }
}

This is the part of the code. What is wrong in this? It goes to the navigation failed function when I click on an item in the list box. I want to get the item pressed and add it to the navigation page. Could you help please?

Answer 1

Remove the quotes around "s":

NavigationService.Navigate(new Uri(s, UriKind.Relative));

If you put s , then you're using the contents of the variable s . If you use "s" , then you're creating a new string containing the literal value s .

Answer 2

Looking at the way you are getting index from datasource I feel, may be you are trying to pass a QueryString argument to your page..if so, try like this

string s = "/Page.xaml?index=" + index;

and in your destination page load, read that argument

string qryArgVal = "";
NavigationContext.QueryString.TryGetValue("index", out qryArgVal);

Answer 3

i found myself the answer.in a listbox the simplest way of getting the index is int k = ((ListBox)sender).SelectedIndex; and now your k will have the index value