il代码，

.assembly extern mscorlib {}
 
 .assembly Test
 {
     .ver 1:0:1:0
 }
 .module test.exe
  
 .method static void main() cil managed
 {
     .maxstack 5
     .entrypoint
     
     ldstr "Enter First Number"
     call void [mscorlib]System.Console::WriteLine (string)
     call  string [mscorlib]System.Console::ReadLine ()
     call int32 [mscorlib]System.Int32::Parse(string)

     ldstr "Enter Second Number"
     call void [mscorlib]System.Console::WriteLine (string)
     call  string [mscorlib]System.Console::ReadLine ()
     call int32 [mscorlib]System.Int32::Parse(string)

     ble smaller
     ldstr "Second Number is smaller than first."    
     call void [mscorlib]System.Console::WriteLine (string)

     br exit

smaller:
     ldstr "First number is smaller than second."    
     call void [mscorlib]System.Console::WriteLine (string)
exit:    
     ret
 }

提示输入数，获取输入数，转换输入数为整型；然后这句实现比较，

ble smaller，它告诉编译器去检查栈里面的第一数是否小于或等于第二个数,如果是小于,那么它将会跳转到"smaller"这个标签处；

构建运行如下；

还不是很了解IL汇编和其跳转语句，有时间继续；