c# - Any type mapping with different Id types -

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i'm working on event-planning application contacts in phone book. avoiding public virtual , protected stuff, contact class looks like: 

class contact {     //...     int32 id { get; private set; } //primary key;     string name { get; private set; }      //... }

a customer asked me handle both own phone book , application's one. thought extract icontact interface contact, , add class internalcontact (this name sucks, know), implementing same interface. problem customer's db uses assigned string primary key, contact''s id type , internalcontact's id type different. possible map invitation.contact property using <any> type mapping, id types different?

thanks in advance, giulio

not sure if asking create classes:

interface icontact<t> {     t id { get; } }  public class contact : icontact<int> {     public int id { get; private set; } }  public class internalcontact : icontact<string> {     public string id { get; private set; } }

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