get all the people or groups information from People picker

private SPFieldUserValueCollection GetPeopleFromPickerControl(PeopleEditor people, SPWeb web)

{

  SPFieldUserValueCollection values = new SPFieldUserValueCollection();

  if (people.ResolvedEntities.Count > 0)

  {

    for (int i= 0; i< people.ResolvedEntities.Count; i++)

    {

        PickerEntity user = (PickerEntity)people.ResolvedEntities[i];

        switch ((string)user.EntityData["PrincipalType"])

        {

          case "User":

            SPUser webUser = web.EnsureUser(user.Key);

            SPFieldUserValue userValue = new SPFieldUserValue(web, webUser.ID, webUser.Name);

            values.Add(userValue);

          break;

  

          case "SharePointGroup":

            SPGroup siteGroup = web.SiteGroups[user.EntityData["AccountName"].ToString()];

            SPFieldUserValue groupValue = new SPFieldUserValue(web, siteGroup.ID, siteGroup.Name);

            values.Add(groupValue);                      

          break;

        }

      }

    }

    return values;

  }