Creating a helpful API use polymorphism to make developers and users jobs easier

Recently started to make an API based on REST Using a little Polymorphism - i.e. the same name with different parameter types:

Samples:

public Eloqua.API.Models.Contact GetContact(string email)

        { /* gets the first contact with this email */

           List<Eloqua.API.Models.Contact> cg = SearchContacts(email, 1, 1);

           Eloqua.API.Models.Contact c = cg.FirstOrDefault<Eloqua.API.Models.Contact>();

           return c;

        }

public Eloqua.API.Models.Contact GetContact(int id)

        {   /* gets the first contact with this id */

            Eloqua.API.Models.Contact c = SearchContacts(id.ToString(), 1, 1).FirstOrDefault<Eloqua.API.Models.Contact>();

            return c;

        }

public List<Eloqua.API.Models.Contact> SearchContacts(string searchTerm, int page, int pageSize)

        {

            RestRequest request = new RestRequest(Method.GET)

            {

                RequestFormat = DataFormat.Json,

                Resource = string.Format("/data/contacts?search={0}&page={1}&count={2}&depth=complete&sort=firstName&dir=asc", EncodeString(searchTerm),

                                  page, pageSize)

            };

   IRestResponse<RequestObjectList<Eloqua.API.Models.Contact>> response = _client.Execute<RequestObjectList<Eloqua.API.Models.Contact>>(request);

            List<Eloqua.API.Models.Contact> contacts = response.Data.elements;

            return contacts;

        }