How to handle System.Net.WebException in windows phone

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Windows

phone

I have a windows phone applications with toast notifications enabled. Here in this i am getting a System.Net.WebException when user taps on toast notification only when phone is pin locked. Except this is in every case its working fine.

In my application if user taps on toast notification he will redirect to other page there we will made one service call to fetch the data. I thought this was causing the issue.

What i am thinking is when user taps on toast notification its perfectly redirecting to the targeted page, and then it is asking for the user to unlock his phone (unlock screen will appear after redirecting the page). after unlocking the phone he then redirects to the previously opened page . actually the service call is already made so it is causing the webexception.

i want to handle this situation please suggest me your ideas.

thanks a lot for all your suggestions.