c# - Accessing Properties of Base class from derived class using Generic List -

in c#, best way access property of base class when generic list contains derived class.

public baseclass1 {   public property a{get;set;}    public property b{get;set;} }  public baseclass2:baseclass1 {    public property c{get;set;}    public property d{get;set;} } public classa:baseclass2 { }  public class implement   {     list<classa> list1 = new list<classa>()      console.writeline("would add person");//if yes add person list dynamically      {         //is possible acesses properties of baseclass using derived class list        list1.property = console.readline();//read input console        list1.property b = console.readline();//read input console            .            .        list.property d = console.readline();//read input console         list1.add(property a,property b);//add properties of baseclass1 , baseclass2 derived class       }    } 

i want take values of base class properties console , add values list , increase list if user wants add more objects of classa. possible??

list1.add( new classa { = a, b = b, c = c } );