How to access variable of an Outer class in the inner class in c# [duplicate]

Question

i have two class i need to declare a variable common to both the classes..

In case of Nested classes i need to access the Outer class variable in the inner class

please give me a better way to do this in c#.

Sample code

 Class A
   {
     int a;
     Class B
        {
               // Need to access " a" here
        }
    }

Thanks in advance

Answer 1

First suggestion is to pass a reference to the Outer class to the Inner class on construction, so Inner class that then reference Outer class properties.

Answer 2

public Class Class_A
{
    int a;

    public Class Class_B
    {
        Class_A instance;

        public Class_B(Class_A a_instance)
        {
            instance = a_instance;
        }

        void SomeMethod()
        {
            int someNumber = this.instance.a;
        }
    }
}