sample

class MyMain
        {
            private MyFirstEnum myType = MyFirstEnum.DOCUMENT; //Type that I know according to my object

            public void Boo()
            {
                //Here I need to create new Foo obeject that get 
                //MySecondEnum as a param, but this MySecondEnum is not compatible with MyFirstEnum
                //what I need to do here?

                //Solotion is:
                //Create new MyFirstEnum type and compare it with type that I know - myType class member(in our case)
                MySecondEnum myNeededType = MySecondEnum.DEFAULT;

                if(myType == MyFirstEnum.DOCUMENT)
                {
                    myNeededType = MySecondEnum.DOCUMENT; //Now I know my needed type. Other words I compare my type that I know to type that I need.
                }

                //For now I am ready to create object that I need
                Foo myObject = new Foo(myNeededType); //TA-DA :)
            }
        }

        class Foo
        {
            public Foo(MySecondEnum type)
            {

            }
        }

        enum MyFirstEnum // My first type
        {
            DEFAULT,
            DOCUMENT,
            FOLDER
        }

        enum MySecondEnum // My second type
        {
            DEFAULT,
            DOCUMENT,
            FOLDER
        }