public ActionResult Assign(OpportunityAssignHelper model)
        {
            var opportunity = _db.Opportunities.First(o => o.OpportunityId == model.RelatedOpportunityId);

            opportunity.IsAssigned = true;
            opportunity.AssignedTo = model.AssignedTo;
            _db.SaveChanges();

            return(Redirect(Request.UrlReferrer?.ToString()));
        }
        public ActionResult Reassign(OpportunityAssignHelper model)
        {
            var opportunity = _db.Opportunities.First(o => o.OpportunityId == model.RelatedOpportunityId);

            if (model.Unassign)
            {
                opportunity.IsAssigned = false;
                opportunity.AssignedTo = String.Empty;
                _db.SaveChanges();
            }
            else
            {
                opportunity.AssignedTo = model.AssignedTo;
                _db.SaveChanges();
            }

            return(Redirect(Request.UrlReferrer?.ToString()));
        }