iMentor.Entities.iMentorUserInfo.GetRoleIdByUser C# (CSharp) Method

        public int GetRoleIdByUser(iMentorUser user)
        {
            using (iMAST_dbEntities db = new iMAST_dbEntities())
            {
                var userRole = db.iMentorUserRoles.Where(x => x.UserId == user.Id).FirstOrDefault();

                var result = userRole.RoleId;

                return result;
            }
        }

        public List<iMentorUserInfo> GetUsersByListing(string data)
        {
            using (iMAST_dbEntities db = new iMAST_dbEntities())
            {
                var users = new List<iMentorUserInfo>();

                if (data != null)
                {
                    var userIds = new List<int>();
                    int id = Convert.ToInt32(data);

                    if (id > 0)
                    {
                        var listing = db.ListingModels.Where(x => x.Id == id).FirstOrDefault();

                        var assignments = db.AssignedListings.Where(x => x.ListingId == listing.Id).ToList();

                        foreach (AssignedListing assignment in assignments)
                        {
                            var user = db.iMentorUsers.Where(x => x.Id == assignment.UserId).FirstOrDefault();

                            var u = new iMentorUserInfo();
                            u.Id = user.Id;
                            u.UrlId = user.UrlId;
                            u.UserName = user.UserName;
                            u.FirstName = user.FirstName;
                            u.LastName = user.LastName;
                            u.Email = user.Email;
                            u.RoleId = u.GetRoleIdByUser(user);
                            u.Role = u.GetRoleName(user);
                            u.ShowOnlyAssignedListings = user.ShowOnlyAssignedListings;
                            u.IconIndex = user.IconIndex;

                            users.Add(u);
                        }
                    }
                }

                return users;
            }
        }