I encounter a strange problem: CLR always tells me that there exists 
invalid IL in methods, when the method is .ctor or there is nothing in the 
code.

but other methods can go right. For example, there is a .ctor method, and 
its original IL like this:

.ctor{
IL_0000: ldarg.0
        IL_0001: call System.Void System.Object::.ctor()
        IL_0006: ret
       }

after I modify it, it is like:
.ctor {
IL_0000: ldloc.0
        IL_0001: ldloc.1
IL_0002: ldstr "IL_0000: ldarg  "
IL_0007: stloc.0
IL_0008: ldstr "..\..\..\MyLibrary\bin\Debug\trace.txt"
IL_000d: stloc.1
IL_000e: ldloc.0
IL_000f: ldloc.1
IL_0010: call System.Void 
MyLibrary.Scheduler::Write(System.String,System.String)
        IL_0015: stloc.1
IL_0016: stloc.0

IL_0017: ldarg.0
IL_0018: ldloc.0
IL_0019: ldloc.1
IL_001a: ldstr "IL_0001: call System.Void System.Object::.ctor() "
IL_001f: stloc.0
IL_0020: ldstr "..\..\..\MyLibrary\bin\Debug\trace.txt"
IL_0025: stloc.1
IL_0026: ldloc.0
IL_0027: ldloc.1
IL_0028: call System.Void 
MyLibrary.Scheduler::Write(System.String,System.String)
IL_002d: stloc.1
IL_002e: stloc.0
IL_002f: call System.Void System.Object::.ctor()

IL_0034: ret
}
After modification, the program should output the running instruction trace 
in a txt. And I have tried it in other program, it can work well. 

But when it comes to .ctor method or the method with nothing in it, the CLR 
will give such error: there exists invalid instructions in program.

What mistake have I made? Can you give me some advices?Thank you. 

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