CodeAnalysis exception CA1703, CA1804 and CA2135

Hi Team,

We have migrated our code from VS 2010 to VS 2015 and while running the Code Analysis tool on the solution i am facing the below three exceptions:

CA2135 Level 2 security it should be protected by being security critical instead. Remove the LinkDemand.

CA1703 Correct the spelling.

CA1804 Declare a variable which is never used.

Note: Code Analysis is working fine with Visual Studio 2010 with the same rule set and dictionary variables.

.Net framework version upgraded from V4.0 to V4.7.

Please guide me. Thanks.