count of the same elements in list c# code example

Example 1: c# find duplicates in list

var query = lst.GroupBy(x => x)
              .Where(g => g.Count() > 1)
              .Select(y => y.Key)
              .ToList();

Example 2: get count of specific objects in list c#

var myList = new List<int>()
{
  0, 1, 2, 1, 5, 4, 8, 5, 2, 7, 1, 9
};

int count = 0;
foreach (var number in list)
{
  if (number == 2)
    count++;
}

Console.WriteLine("Number of 2s in list is: " + count);
// Output:
// Number of 2s in list is: 2