Access xml file

Hello
I am creating a survey application.
In order to insert the questions i have craeted an xml file which will be part of the application assets.
How ever i am unable to access it using HTTPservice. I am getting the following massage. How do i retrieve the information for the file?
Is there any other method besside HTTPservice?
Thanks
Amir

Or reference the file as the source for an XML object, eg:
<mx:XML id="xmlImageDatabase" source="gallery.xml"/>
did that in this example, same file loading principle
http://mattlefevre.com/viewExample.php?tut=flex&proj=Basic%20Gallery

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I'm trying to set up a basic read, write and delete code for XML files which I can build upon in the future. The three methods are bound to three buttons on the page and all three calls are awaited. Here's my code:
Write:
XElement uservarnodes = new XElement("uservars",
new XElement("uservar1", "1"),
new XElement("uservar2", "2"),
new XElement("uservar3", "3"),
new XElement("uservar4", "4"),
new XElement("uservar5", "5"),
new XElement("uservar6", "6"),
new XElement("uservar7", "7"),
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mydataWriter.WriteString(uservarnodes.ToString());
await mydataWriter.StoreAsync();
await outputStream.FlushAsync();
Read (outputs the data to a textblock):
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And the intervals between my taps isn't that short that you'd expect that the previously called method still had not finished completing. I don't understand why I'm getting the access denied error.
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var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
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async public static Task<bool> SaveTextFileAsync(string filename, string data)
byte[] fileBytes = System.Text.Encoding.UTF8.GetBytes(data);
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s.Write(fileBytes, 0, fileBytes.Length);
return true;
catch
return false;
(need using System.IO namespace)
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Access xml file

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