Million Dollar Question on Win Form development in Win 8 + using Sensors

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Windows

I have a Win 8 Desktop application with a Compass sensor build within the Laptop.

BackGround:

In order to use the sensor API's in WinForm App we need to add

<TargetPlatformVersion>8.0</TargetPlatformVersion>

under

<PropertyGroup> 

section of Project file

Problem Starts Here:

The Compass reading property : HeadingTrueNorth has a default null value. In our App , if we are verifying for null or try to access this property the code is not compiling.

It says you must reference System.RunTime 4.0.0.0 DLL.

transform.Angle = 360 - double.Parse(reading.HeadingTrueNorth.ToString());

Now the problem is we can't reference System.Runtime 4.0.0.0 DLL because there is a conflict Types B/w 4.0 and 4.5 as we already Referenced Windows DLL which will be used for sensors etc.

How to resolve this ?