dynamic methods are not saved with the assembly?

I am working with a library dynamically generating IL code. In order to debug my changes, I modified library to save the assembly it generates. It seems that only method signatures are present in the saved DLL, when I browse with decompiler. I do not see the actual methods implementations. Sorry if this is something trivial. I never touched Reflection.Emit until now. Below is my code:

static AssemblyBuilder BuildAssembly(
  Type itf,
  string assemblyName,
  string moduleName,
  string typeName,
  AssemblyBuilderAccess access)
{
  string urlString = GetXmlRpcUrl(itf);
  ArrayList methods = GetXmlRpcMethods(itf);
  AssemblyName asmName = new AssemblyName();
  asmName.Name = assemblyName;
  if (access == AssemblyBuilderAccess.RunAndSave)
    asmName.Version = itf.Assembly.GetName().Version;
  AssemblyBuilder asmBldr = AppDomain.CurrentDomain.DefineDynamicAssembly(
    asmName, access);
  ModuleBuilder modBldr = (access == AssemblyBuilderAccess.Run
    ? asmBldr.DefineDynamicModule(asmName.Name)
    : assBldr.DefineDynamicModule(assName.Name, moduleName));
  TypeBuilder typeBldr = modBldr.DefineType(
    typeName,
    TypeAttributes.Class | TypeAttributes.Sealed | TypeAttributes.Public,
    typeof(XmlRpcClientProtocol),
    new Type[] { itf });
  BuildConstructor(typeBldr, typeof(XmlRpcClientProtocol), urlString);
  BuildMethods(typeBldr, methods);
  BuildBeginMethods(typeBldr, beginMethods);
  BuildEndMethods(typeBldr, endMethods);
  typeBldr.CreateType();
  asmBldr.Save(moduleName);
  return asmBldr;
}

I am working with Mono [using XamarinStudio to browse the assembly]. Don't know whether this might be relevant. Any suggestions are appreciated.

Thank you.