sn -k keys.snk

csc /t:library /out:vehicle.dll /keyfile:keys.snk vehicle.cs

gacutil /i vehicle.dll

vbc /r:vehicle.dll /t:library /out:car.dll car.vb

csc /r:vehicle.dll /t:library /out:plane.dll plane.cs

csc /r:vehicle.dll;car.dll;plane.dll /t:exe /out:drive.exe drive.cs

del vehicle.dll