如何通过类的其他方法更改传递的引用变量的值

Question

如何通过类的其他方法更改传递的引用变量的值。 我已将评论嵌入代码段中。

class A
    {
        int myVar = 0;
        void SomeMethodOfA ()
        {
            B obj = new B(ref myVar);
            Console.WriteLine(myVar);   // Need updated value of myVar
        }
    }

class B
{
    int newVar;   // Intentionally not initialised.
    public B()
    {
        //something
    }
    public B(ref int x) : this()
    {
        // Purpose is to change the value of 'x' by the other method's of this class.
        newVar = x; //This is not assigning newVar the reference of x
                    // What I am missing here...?
    }
    private void buttonSomething_Click(object sender, EventArgs e)
    {
        newVar++;   //This change in only local.
                    // I need this change to reflect in 'x'
    }
}