Answer Posted / rajesh kardile

In C# 3.0 with Linq here how you will do

int[] intArray = { 1, 1, 4, 5, 6, 1, 2, 5, 4, 1, 2 };

var groups = from g in intArray
orderby g
group g by g;

StringBuilder stringBuilder = new StringBuilder();

foreach (var g in groups)
stringBuilder.Append(g.Key + "-" + g.Count() + ",");

Console.WriteLine(stringBuilder.ToString());

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