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<H1>[mono-android] New Mono for Android release does not work with some samples on GitHub</H1>
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<B>Tomasz Cielecki</B>
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<A HREF="mailto:monodroid%40lists.ximian.com?Subject=%5Bmono-android%5D%20New%20Mono%20for%20Android%20release%20does%20not%20work%20with%0A%20some%20samples%20on%20GitHub&In-Reply-To=CACWcBbkjivo7arYtaEJyMHgBJ-_A2d7wN6qAERmG_AzYTksrOg%40mail.gmail.com"
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TITLE="[mono-android] New Mono for Android release does not work with some samples on GitHub">tomasz at ostebaronen.dk
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<I>Tue Dec 6 07:48:41 EST 2011</I>
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<PRE>Or wait I was a bit quick there.
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Give me a moment and I will make a test project for you to see what is
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happening.
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On Tue, Dec 6, 2011 at 1:45 PM, Tomasz Cielecki <<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">tomasz at ostebaronen.dk</A>> wrote:
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><i> OK, that seems a bit strange to me. Your suggestion works though. I
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</I>><i> would have though that the OverlayItem would explicitly be
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</I>><i> implementing Java.Lang.Object rather than just Object so that it would
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</I>><i> be unambiguous.
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</I>><i>
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</I>><i> Maybe someone should make a note about this somewhere so that people
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</I>><i> do not make the same mistake as I did.
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</I>><i>
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</I>><i> On Tue, Dec 6, 2011 at 1:35 PM, Atsushi Eno
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</I>><i> <<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">atsushieno at veritas-vos-liberabit.com</A>> wrote:
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</I>>><i> Ah, no that's not a bug :)
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</I>>><i> You likely have "using System;" on top of your source and that binds
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</I>>><i> "Object" class to System.Object type. Unlike "java.lang" package for
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</I>>><i> Java compilers, C# compiler does not import "Java.Lang" by default, so
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</I>>><i> you have to explicitly write "using Java.Lang;" .
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</I>>><i>
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</I>>><i> However, if you do that, C# compiler will error it out because "Object"
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</I>>><i> name is now ambiguous between "System.Object" and "Java.Lang.Object".
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</I>>><i> So, you will either have to give up using "using" statement or add
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</I>>><i> explicit declaration that "using Object = Java.Lang.Object;" .
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</I>>><i>
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</I>>><i> Atsushi Eno
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</I>>><i>
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</I>>>><i> So the OverlayItem is having the using Java.Lang; in the top of the
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</I>>>><i> file and is implementing Object, but then the compiler thinks it is
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</I>>>><i> System.Object rather than Java.Lang.Object. I guess this is a bug that
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</I>>>><i> you will have to correct.
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</I>>>><i>
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</I>>>><i> Meanwhile I am just using
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</I>>>><i>
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</I>>>><i> protected override Java.Lang.Object CreateItem(int index)
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</I>>>><i>          {
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</I>>>><i>              return overlayItems.ElementAt(index);
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</I>>>><i>          }
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</I>>>><i>
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</I>>>><i> Which seems to work fine.
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</I>>>><i>
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</I>>>><i> I have created a bug report: <A HREF="http://bugzilla.xamarin.com/show_bug.cgi?id=2358">http://bugzilla.xamarin.com/show_bug.cgi?id=2358</A>
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</I>>>><i>
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</I>>>><i> On Tue, Dec 6, 2011 at 11:55 AM, Atsushi Eno
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</I>>>><i> <<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">atsushieno at veritas-vos-liberabit.com</A>>  wrote:
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</I>>>>><i> Yes, as the error message tells, it must be derived from Java.Lang.Object.
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</I>>>>><i>
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</I>>>>><i> Atsushi Eno
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</I>>>>><i>
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</I>>>>>><i> Is this because Overlay item is inheriting from System.Object rather
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</I>>>>>><i> than Java.Lang.Object?
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</I>>>>>><i>
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</I>>>>>><i>        public class OverlayItem : Object
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</I>>>>>><i>
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</I>>>>>><i> On Tue, Dec 6, 2011 at 9:45 AM, Tomasz Cielecki<<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">tomasz at ostebaronen.dk</A>>    wrote:
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</I>>>>>>><i> I get the same error even if CreateItem returns OverlayItem. So
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</I>>>>>>><i> something is wrong somewhere.
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</I>>>>>>><i>
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</I>>>>>>><i> On Tue, Dec 6, 2011 at 9:43 AM, Tomasz Cielecki<<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">tomasz at ostebaronen.dk</A>>    wrote:
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</I>>>>>>>><i> OK. About that OverlayItem. I have a Custom overlay item which looks like this:
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</I>>>>>>>><i>
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</I>>>>>>>><i>      class NMTOverlayItem : OverlayItem
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</I>>>>>>>><i>      {
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</I>>>>>>>><i>          private float[] color;
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</I>>>>>>>><i>
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</I>>>>>>>><i>          public NMTOverlayItem(GeoPoint point, String title, String
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</I>>>>>>>><i> snippet, float[] color)
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</I>>>>>>>><i>              : base(point, title, snippet)
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</I>>>>>>>><i>          {
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</I>>>>>>>><i>                      this.color = color;
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</I>>>>>>>><i>          }
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</I>>>>>>>><i>
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</I>>>>>>>><i>          public float[] Color
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</I>>>>>>>><i>          {
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</I>>>>>>>><i>              get { return color; }
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</I>>>>>>>><i>          }
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</I>>>>>>>><i>      }
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</I>>>>>>>><i>
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</I>>>>>>>><i> Now in the itenized overlay I have the CreateItem method:
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</I>>>>>>>><i>
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</I>>>>>>>><i>          protected override NMTOverlayItem CreateItem(int index)
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</I>>>>>>>><i>          {
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</I>>>>>>>><i>              return overlayItems.ElementAt(index);
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</I>>>>>>>><i>          }
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</I>>>>>>>><i>
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</I>>>>>>>><i> I get the following error:
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</I>>>>>>>><i>
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</I>>>>>>>><i> 'NSPublic.AndroidClient.NMTItemizedOverlay.CreateItem(int)': return
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</I>>>>>>>><i> type must be 'Java.Lang.Object' to match overridden member
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</I>>>>>>>><i> 'Android.GoogleMaps.ItemizedOverlay.CreateItem(int)'
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</I>>>>>>>><i>
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</I>>>>>>>><i> Any ideas as to why this is happening?
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</I>>>>>>>><i>
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</I>>>>>>>><i> On Mon, Dec 5, 2011 at 6:52 PM, Tomasz Cielecki<<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">tomasz at ostebaronen.dk</A>>    wrote:
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</I>>>>>>>>><i> Awesome, will give it a go tomorrow :-)
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</I>>>>>>>>><i>
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</I>>>>>>>>><i> As always good job on the new release!
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</I>>>>>>>>><i>
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</I>>>>>>>>><i> On Dec 5, 2011 5:38 PM, "Jonathan Pryor"<<A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">jonp at xamarin.com</A>>    wrote:
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</I>>>>>>>>>><i> On Dec 5, 2011, at 11:25 AM, Tomasz Cielecki wrote:
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</I>>>>>>>>>>><i> Due to changes to how sensors work, i.e. stuff being moved into
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</I>>>>>>>>>>><i> SensorTypes the samples on GitHub do not work anymore.
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</I>>>>>>>>>><i> Changes needed to get the samples working with the new release were done
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</I>>>>>>>>>><i> on the release-2-0 branch, which was just merged to master ~10 minutes ago.
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</I>>>>>>>>>><i> Please update your repo and see if that fixes it. :-)
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</I>>>>>>>>>><i>
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</I>>>>>>>>>>><i> Also there has been some changes in the ItemizedOverlay now having the
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</I>>>>>>>>>>><i> CreateItem method registered, but it needs to return a
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</I>>>>>>>>>>><i> Java.Lang.Object, does that mean that my custom OverlayItem has to
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</I>>>>>>>>>>><i> inherit from Java.Lang.Object? I thought OverlayItem was already a
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</I>>>>>>>>>>><i> Java.Lang.Object?
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</I>>>>>>>>>><i> OverlayItem inherits Java.Lang.Object, so your class inheriting from
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</I>>>>>>>>>><i> OverlayItem will also inherit Java.Lang.Object, just not directly.
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</I>>>>>>>>>><i>
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</I>>>>>>>>>><i> Subclassing OverlayItem is fine (and required, iirc).
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</I>>>>>>>>>><i>
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</I>>>>>>>>>>><i> Is there a list of changes made in the newest release somewhere?
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</I>>>>>>>>>><i> <A HREF="http://android.xamarin.com/Releases/Mono_for_Android_4/Release_4.0.0#API_Changes">http://android.xamarin.com/Releases/Mono_for_Android_4/Release_4.0.0#API_Changes</A>
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</I>>>>>>>>>><i>
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</I>>>>>>>>>><i>    - Jon
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</I>>>>>>>>>><i>
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</I>>>>>>>>>><i> _______________________________________________
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</I>>>>>>>>>><i> Monodroid mailing list
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</I>>>>>>>>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">Monodroid at lists.ximian.com</A>
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</I>>>>>>>>>><i>
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</I>>>>>>>>>><i> UNSUBSCRIBE INFORMATION:
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</I>>>>>>>>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">http://lists.ximian.com/mailman/listinfo/monodroid</A>
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</I>>>>>>>><i>
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</I>>>>>>>><i> --
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</I>>>>>>>><i> Med Venlig Hilsen / With Best Regards
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</I>>>>>>>><i> Tomasz Cielecki
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</I>>>>>>>><i> <A HREF="http://ostebaronen.dk">http://ostebaronen.dk</A>
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</I>>>>>>><i>
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</I>>>>>>><i> --
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</I>>>>>>><i> Med Venlig Hilsen / With Best Regards
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</I>>>>>>><i> Tomasz Cielecki
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</I>>>>>>><i> <A HREF="http://ostebaronen.dk">http://ostebaronen.dk</A>
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</I>>>>>><i>
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</I>>>>><i> _______________________________________________
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</I>>>>><i> Monodroid mailing list
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</I>>>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">Monodroid at lists.ximian.com</A>
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</I>>>>><i>
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</I>>>>><i> UNSUBSCRIBE INFORMATION:
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</I>>>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">http://lists.ximian.com/mailman/listinfo/monodroid</A>
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</I>>>><i>
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</I>>>><i>
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</I>>><i>
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</I>>><i> _______________________________________________
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</I>>><i> Monodroid mailing list
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</I>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">Monodroid at lists.ximian.com</A>
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</I>>><i>
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</I>>><i> UNSUBSCRIBE INFORMATION:
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</I>>><i> <A HREF="http://lists.ximian.com/mailman/listinfo/monodroid">http://lists.ximian.com/mailman/listinfo/monodroid</A>
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</I>><i>
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</I>><i>
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</I>><i>
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</I>><i> --
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</I>><i> Med Venlig Hilsen / With Best Regards
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</I>><i> Tomasz Cielecki
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</I>><i> <A HREF="http://ostebaronen.dk">http://ostebaronen.dk</A>
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</I>
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--
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Med Venlig Hilsen / With Best Regards
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Tomasz Cielecki
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<A HREF="http://ostebaronen.dk">http://ostebaronen.dk</A>
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</PRE>
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