how to hide function of base class

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VB

Respected sir,
I am new in vb.net windows application..i have following problem in classes

public class person
   private id as int16
   public sub Add()
       'procedure for add new person to database
   end sub

end Class

'another derived class 

public class emp Inherits person
   private id as int16
   public sub Add()
       'procedure for add new employee to database
   end sub
end Class

'at form level coding

dim objemp as new emp
objemp.add()  'here i got error..since both class have same function name
              'and i want same name i dont want to change it..

How can we hide base class function/method of same function name as shown in above example..

Please help me...
Thank you..