Please see code belowpublic FieldBuilder BuildField_id(TypeBuilder type)
{
   FieldBuilder field = type.DefineField(
       "_id",
       typeof(Int32),
         FieldAttributes.Private
       );
   return field;
}
public MethodBuilder BuildMethodget_ID(TypeBuilder type)
{
   // Declaring method builder
   MethodBuilder method = type.DefineMethod("get_ID");
   // Preparing Reflection instances
   FieldInfo field1 = typeof(Role).GetField("_id", BindingFlags.Public |
BindingFlags.NonPublic);
   // Method attributes
   method.Attributes =
         System.Reflection.MethodAttributes.Public
       | System.Reflection.MethodAttributes.HideBySig;
   // Setting return type
   method.SetReturnType(typeof(Int32));
   // Adding parameters
   ILGenerator gen =  method.GetILGenerator();
   // Preparing locals
   LocalBuilder CS$1$0000 =  gen.DeclareLocal(typeof(Int32));
   // Preparing labels
   Label label10 =  gen.DefineLabel();
   // Writing body
   gen.Emit(OpCodes.Nop);
   gen.Emit(OpCodes.Ldarg_0);
   gen.Emit(OpCodes.Ldfld,field1);
   gen.Emit(OpCodes.Stloc_0);
   gen.Emit(OpCodes.Br_S,label10);
   gen.MarkLabel(label10);
   gen.Emit(OpCodes.Ldloc_0);
   gen.Emit(OpCodes.Ret);
   // finished
   return method;
}

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