How to Read PDF file Without save on Local storage windows phone 8 C#

I need to open pdf file without store on local storage. i tried this code but i am facing some issues when i am try to read pdf file through PDF Reader, Adobe Reader, etc. after click back navigation i deleted current file from local folder. But after closed my application and I am directly open PDF Reader, Adobe Reader... etc. File is exist(still have on my library). I could not delete the file. Please let me know is possible on windows phone 8 C#.

please see my code below.

Code:

---

protected async override void OnNavigatedTo(NavigationEventArgs e)
    {
        try
        {

            using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (var fileStream = store.OpenFile("your-file.pdf", FileMode.Truncate, FileAccess.ReadWrite, FileShare.ReadWrite))
                {
                    fileStream.Flush();
                    fileStream.Close();
                    if (store.FileExists("your-file.pdf"))
                    {
                        store.DeleteFile("your-file.pdf");
                    }

                    StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;

                    await local.DeleteAsync(StorageDeleteOption.PermanentDelete);
                }
            }

        }
        catch
        {
          //File does not exist.
        }

    }

private async void Button_Click(object sender, RoutedEventArgs e)

    {

        //RestSharp from Nuget

        var client = new RestClient("http://ift.tt/297xE5e;);

        var request = new RestRequest("/magazine/file/PDF-2.pdf?c34tP5IxEK=2b26c756615a40844a6564d13a3eb875", Method.GET);




        var response = await client.ExecuteTaskAsync(request);




        byte[] buffer = response.RawBytes;



        using (IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication())

        {

            using (IsolatedStorageFileStream stream = storageFile.OpenFile("your-file.pdf", FileMode.Create))

            {

                await stream.WriteAsync(buffer, 0, buffer.Length);

            }

        }




        StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;

        StorageFile pdffile = await local.GetFileAsync("your-file.pdf");




        // Launch the pdf file.

        Windows.System.Launcher.LaunchFileAsync(pdffile);

    }

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Main Functionality is only read the pdf file without saving.

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