Testing for repeated characters in a string

Question

I\'m doing some work with strings, and I have a scenario where I need to determine if a string (usually a small one < 10 characters) contains repeated characters.

Answer 1

How about something like:

string strString = "AA BRA KA DABRA";

var grp = from c in strString.ToCharArray() 
        group c by c into m
        select new { Key = m.Key, Count = m.Count() };

foreach (var item in grp)
{
    Console.WriteLine(
        string.Format("Character:{0} Appears {1} times", 
        item.Key.ToString(), item.Count));
}