How to specify time Spans for Message Trace in wpf Application

Question

I had been working on this report on Message trace in Office365. I would want to give filters for Startdate and enddate from my WPF(C#) application. How can i do that.
i tried the following. When i specify them directly in the URL. they work perfectly fine but when i try to give them from the code, thats where it says value cannot be null,Parameter name: Source. What could be the problem.
ub.Query="$filter=StartDate eq datetime'2015-01-01T00:00:00' and EndDate eq datetime'2015-01-07T23:59:59' &";
 string fullRestURL = Uri.EscapeUriString(ub.Uri.ToString());
ub.Query = "$filter=StartDate%20eq%20datetime%272015-01-01T05:00:00%27%20and%20EndDate%20eq%20datetime%272015-01-11T06:00:00%27%20&";
 string fullRestURL = Uri.EscapeUriString(ub.Uri.ToString());

Answer 1

Hi HarshitaK,
This forum(WPF) is talk about how to use XAML technologies to productively create visually appealing and differentiating applications and to improve user experience.
I found your question is about MessageTrace report:
http://msdn.microsoft.com/EN-US/library/office/jj984335(v=office.15).aspx
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