Datacontractserializer and Namespace

Hi, I have a problem trying to deserialize an xml file created from a different namespace. The code I use is

            file = await ApplicationData.Current.LocalFolder.GetFileAsync("EortologioMovingEntries.xml");
            try
            {
                using (IRandomAccessStream stream =
                await file.OpenAsync(FileAccessMode.Read))
                using (Stream inputStream = stream.AsStreamForRead())
                {
                    DataContractSerializer serializer = new DataContractSerializer(typeof(Anniversaries), "Anniversaries", "http://ift.tt/1rZiihn;);
                    tempAnniversaries = serializer.ReadObject(inputStream) as Anniversaries;
                }
            }
            catch (Exception ex)
            {
                error = ex.ToString();
                tempAnniversaries.Entries.Add(new AnniversaryEntry("Ena", DateTime.Now, "skata", PriorityEnum.High));                
            }

Eortologio.Model is the namespace that the file was created. I don't get any exceptions but the tempAnniversaries returns null.

this is the start of the xml file.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:Anniversaries xmlns:ns2="http://ift.tt/1rZiihn; xmlns:xsi="http://ift.tt/1m4M9U6;
        <ns2:Entries>
                <ns2:AnniversaryEntry>
                        <ns2:anniversaryName>Τελώνου και Φαρισαίου - Αρχή Τριωδίου</ns2:anniversaryName>
                        <ns2:anniversaryPriority>Medium</ns2:anniversaryPriority>
                </ns2:AnniversaryEntry>
                <ns2:AnniversaryEntry>
                        <ns2:anniversaryName>Του Ασώτου</ns2:anniversaryName>
                        <ns2:anniversaryPriority>Medium</ns2:anniversaryPriority>
                </ns2:AnniversaryEntry>

Any ideas? Thank you.