cs_virtual.cs

class BaseClass
{
    public virtual string Name { get; set; }
}

class DerivedClass : BaseClass
{
    public override string Name
    {
        get
        {
            return base.Name;
        }
        set
        {
            base.Name = value + " X";
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        BaseClass c1 = new BaseClass { Name = "c1" }; //Name will be c1
        DerivedClass c2 = new DerivedClass { Name = "c2" }; //Name will be c2 X
    }
}