I encounter a strange problem: CLR always tells me that there exists 
invalid IL in methods, where there is no codes or it is .ctor method, 

but other method can goes 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 modified it, it goes 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 try 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 instruction in program.

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

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