访问抽象类方法C＃，ASP.net

Question

I have the following classes in my program and now I want to access the method M2() present in the class Y. I tried to access it by creating the object of class Z and then casting it with variable of class X and calling x.M2(10,5) but instead of class Y it is still invoking the method M2() present in the class X. Thanks.

public partial class Abstract_Class : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Z z = new Z();
        int r1 = z.M2(10, 20); //gives output -20
        X x = z;
        int r2 = x.M2(10,5); //gives output 10 while I want it to print 15
    }
}
public class W
{
    public virtual int M2(int x, int y)
    {
        return x - y;
    }
}
public abstract class X : W
{
    public abstract void M1();
    public override int M2(int x, int y)
    {
        return 2*(x-y);
    }
}
public abstract class Y : X
{
    public sealed override int M2(int x, int y)
    {
        return 3 * (x - y);
    }
}
public class Z : X
{
    public override void M1()
    {
    }
}

Answer 1

You would need to create an instance of Y . Since it's abstract , you would have to create some subclass of it.

public class SubY : Y
{

}

Then in your code write something like:

var suby = new SubY();
int r2 = suby.M2(10, 5); //15