How to count the frequency of bundle of number using c#?

Question

Can somebody help me to run this program using c#. This program is to calculate the frequency of the number, for example 12 appear 10x. Before this I try to sort all list

Answer 1

Assuming you have a list of numbers:

var numbers = new List{ 1, 2, 3, 4, 1, 2, 2, 3 };

Then we can use Linq to achieve what you want:

var frequencies = 
    numbers.GroupBy( n => n ).Select( n => new { Value=n.Key, Count=n.Count() } );

foreach (var f in frequencies)
{
    Debug.WriteLine(string.Format("Value={0}, Frequency={1}", f.Value, f.Count));
}