public static string FacebookProfileSmallPicture(this ClaimsPrincipal principal )
        {
            var picture = principal.Claim("facebookUserPicture");//  principal.Claim("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier");

            if (!string.IsNullOrEmpty(picture)) return picture;

            return FaceBookProfilePictureFormat( principal.UserId());


        }
 public static string FacebookProfilePicture(this ClaimsPrincipal principal)
 {
    return principal.Claim("facebookUserPicture");//principal.Claim("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier");
    
 }
        public static int? CenterId(this ClaimsPrincipal principal)
        {
            var claim = principal.Claim("CenterId");

            return !string.IsNullOrEmpty(claim) ? (int?)Convert.ToInt32(claim) : null;
        }