An example for impersonate a service reference call

CurrentUserDataHelper.cs

namespace how.To.Impersonate.Service.Reference.Call
{
  public static class CurrentUserDataHelper
  {
    public static String GetCurrentUserId()
    {
        var administrationService = GetServiceReferenceInstance();
        var identity = (WindowsIdentity)HttpContext.Current.User.Identity;
        administrationService.Credentials = CredentialCache.DefaultCredentials;
        using (var impersonationContext = identity.Impersonate())
        {
            return administrationService.CurrentUsers.ToList().First().Identity;
        }
    }

    private static Contracts.CurrentUserData.Administration GetServiceReferenceInstance()
    {
        return new Contracts.CurrentUserData.Administration(new Uri(ConfigurationManager.AppSettings["AKey"]));
    }
  }
}