How to get elements from List which is not repeating using C#

Use the group by clause and check count for each group. If group count is one, its mean it has no repeating record. See example below.

 var strList = new List<Student>()
                   {
                     new Student(){StudentId=1,StudentName = "Student 1"},
                     new Student(){StudentId=2,StudentName = "Student 2"},
                     new Student(){StudentId=1,StudentName = "Student 1"},
                     new Student(){StudentId=3,StudentName = "Student 3"},
                     new Student(){StudentId=2,StudentName = "Student 2"},
                     new Student(){StudentId=2,StudentName = "Student 2"}
                   };




 var result = strList.GroupBy(x => x.StudentId)
                     .Where(x => x.Count() == 1).Select(x => x.First());

The above example returns only “Student 3” record which is not repeating.