How to deploy a silverlight5 app along with Require elevated trust when running in-browser and with certificate for siging up XAP file

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C#

C#4.0

Silverlight5

Currently i have developed one silverlight5 app which will capture image from webcam and store that image in IsolatedStorage.

For this i have checked the Require Elevated trust when running in-browser checkbox and also i done siging up XAP by creating a test certificatea and i have uploaded that app int cloud.

But while running that app in a client mechine using cloud url, we are unable to store that captured image in a Client mechine's isolated storage. It throws an exception just like Unable to store image due to insufficient memory. But i have written a code to increase isolatedstorage memory size by asking user permission. But it not working properly.

Can anyone please help me know the solution for this problem.