multilevel inheritance

You need to set the variable as protected. A protected member can only be accessed by derived classes.

e.g.

public class A
{
    protected int protectedInteger = 1;
}

public class B : A
{
    protected string protectedString = "Hello World";

    private void TestB()
    {
        int myInteger = protectedInteger;
    }
}

public class C : B
{
    private void TestC()
    {
        string myString = protectedString;
        // int myInteger = protectedInteger; // this call will result in an error

    }
}