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using System;
 
public abstract class MenuItem
{
    protected string m_Title;
}
 
public class ContainerItem : MenuItem
{
    void Foo()
    {
        var derivedItem = new ContainerItem();
        derivedItem.m_Title = "test"; // works fine
 
        var baseItem = (MenuItem)derivedItem;
        baseItem.m_Title = "test"; // compiler error!
    }
}

prog.cs(16,18): error CS1540: Cannot access protected member `MenuItem.m_Title' via a qualifier of type `MenuItem'. The qualifier must be of type `ContainerItem' or derived from it
prog.cs(5,22): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty