For many reason we have to use unsafe code like in pointer in dotnet framework , Visual studio cant build the project unless the allow unsafe code option enabled. To enable this option select ur project name solution explorer click right mousebutton go to the properties like below 
Now Click the build tab and check the allow unsafe code option. like below 
Now u can compile unsafe code as much as u wish. thank u
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About kishor datta gupta
Graduate Research Assistant at University of Memphis
Software Engineer at Silicon Orchard LTD.
Former Research Assistant at Lamar University
Former Software Engineer at Samsung R&D Institute Bangladesh
Studies Ph.D. Computer Science at University of Memphis
Studied Masters of Science in Computer Sciences at Lamar University
Studied BSC in CSE at Khulna University of Engineering and Technology
Studied HSC (completed) at Chittagang college 04-06
Studied High school at ST. Placid's High School'04
Studied Junior Secondary School at Saint Mary's School
Lives in Memphis, Tennessee
Now Click the build tab and check the allow unsafe code option. like below 
Now u can compile unsafe code as much as u wish. thank u
kishor datta gupta
thx man…..much needed demo…looking for it from ages …..thanks