oop - CIL instructions unexpected return value -

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i trying create il-instructions manually learning purposes, have run small problem.

i have simple structure interface: "myinterface" single method: "handle", class called "addtwo" implements "myinterface" , "program" class entrymethod. il-dump looks this: 

.class interface public abstract auto ansi myinterface<tinput,toutput> {   .method public hidebysig newslot abstract virtual            instance !toutput  handle(!tinput a_1) cil managed   {   } // end of method myinterface::handle  } // end of class myinterface  .class public auto ansi plustwo        extends [mscorlib]system.object        implements class myinterface<int32,int32> {   .method public hidebysig newslot virtual final            instance int32  handle(int32 x) cil managed   {     // code size       13 (0xd)     .maxstack  2     il_0000:  ldarg      0     il_0004:  nop     il_0005:  nop     il_0006:  ldc.i4     0x2     il_000b:  add     il_000c:  ret   } // end of method plustwo::handle  } // end of class plustwo  .class public auto ansi program        extends [mscorlib]system.object {   .method public static int32  main() cil managed   {     .entrypoint     // code size       34 (0x22)     .maxstack  2     .locals init (int32 v_0)     il_0000:  newobj     instance void plustwo::.ctor()     il_0005:  ldc.i4     0xa     il_000a:  callvirt   instance !1 class myinterface<int32,int32>::handle(!0)     il_000f:  stloc      v_0     il_0013:  nop     il_0014:  nop     il_0015:  ldloc      v_0     il_0019:  nop     il_001a:  nop     il_001b:  ldc.i4     0x5     il_0020:  add     il_0021:  ret   } // end of method program::main } // end of class program

in above expect output be: 17, instead random high integer changes each test. looks memory address or something. can tell, looking @ generated il above, problem might be? appreciated.


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