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List<SelectListItem> allClientUserAndCandidateViews = new List<SelectListItem>();

foreach (var clientUserView in clientUserViews)
            {
                SelectListItem item =
                    new SelectListItem
                    {
                        Value = clientUserView.ClientViewId.ToString(),
                        Text = clientUserView.Name                        
                    };
                allClientUserAndCandidateViews.Add(item);
            }


// First way to return duplicates in a list of SelectListItem objects
foreach (SelectListItem item in allClientUserAndCandidateViews)
            {
                if (dupeDictionary.ContainsKey(item.Text))
                    dupes.Add(item);
                else
                    dupeDictionary.Add(item.Text, item);
            }

            
// Second way to return duplicates in a list of SelectListItem objects
List<SelectListItem> matchinClientUserAndCandidateViews = allClientUserAndCandidateViews
  .GroupBy(x => new { x.Value, x.Text })
  .Where(g => g.Count() > 1)
  .Select(y => y.First())
  .ToList();