private bool IsUserExist(int UserID)
        {
            bool IsUserExist = false;

            using (CKANDBEntities context = new CKANDBEntities())
            {
                if ((from x in context.TblUsers where x.ID == UserID select x.ID).Count() > 0)
                {
                    IsUserExist = true;
                }
            }
            return(IsUserExist);
        }
        private bool IsDuplicateCollaborator(Collaborators objCollaborator)
        {
            bool IsDuplicateCollaborator = false;

            using (CKANDBEntities context = new CKANDBEntities())
            {
                if ((from x in context.TblCollaborators
                     where
                     x.VaultID == objCollaborator.VaultID &&
                     x.CollabeEmail == objCollaborator.CollabeMail &&
                     x.UserID == objCollaborator.UserID
                     select x.ID).Count() > 0)
                {
                    IsDuplicateCollaborator = true;
                }
            }
            return(IsDuplicateCollaborator);
        }