how call function in class parent in child class?

Hi,

Based on what you are asking (it wasn't very clear but I will give it a bash), you will be looking at a scenario like this:

public class MyParentClass
{
    public virtual void SomeMethod()
    {
        /* do parent class stuff here */
    }
}

public class MyChildClass : MyParentClass
{
    public override void SomeMethod()
    {
        /* do child class stuff here */
        base.SomeMethod(); // <--- This will call the parent class method
    }
}

At any point in the overridden method in the child class you can call "base.SomeMethod()".

Hope that helps :)...

If you want to call a none static method of the parent in a child class, the method must be public or protected:

base.MethodName();

If you want to call a none static method of the child in a parent class:
you have to have an instance of the child class and the method must be a public method:

ChildClass instance = new ChildClass();
instance.MethodName();

Or

(new ChildClass()).MethodName();

It's better If you explain why do you want to do so.