How to override Add Method of List<> ?

Question

Hi

 

How to override Add Method of List<> ?

 

public class ccCity : List<cCity>

{

   public cCity this[string name]

   {

      get

      {

         foreach (cCity item in this)

         {

            if (item.cvrName==name)

            {

               return item;

            }

         }

         return null;

      }

   }

   public new void Add(cBaseCVR cvr)

   {

      this.Add(cvr);

   }

}

 

thanks