Finding Repeated values in a String

Finding Duplicate values in String:

First Method:

string[] s1 ={ "a","a","a"};

List<string> myList1 = new List<string>();
List<string> duplicates = new List<string>();


foreach (String s in s1)
{
   if (!myList1.Contains(s))
{
      myList1.Add(s);
   }
else {
      duplicates.Add(s);
}

// show list without duplicates...

foreach (String s in myList1)
{
   Console.WriteLine(s);
}

// show duplicates list...

foreach (String s in duplicates)
{
   Console.WriteLine(s);
}
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Second Method:
int[] p = { 1, 2, 9, 9, 6};
int[] q = p.Distinct().ToArray();