c# - How to find out the duplicate characters in a string? -

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this question has answer here:

i take string integer count

int count=0; string s="wow"

and using foreach loop count number of characters in specified string 

foreach(char ch in s) {  count++ }

so how can count characters repeated in string 'w'.

try )

string test = "aababc";         var result = test.groupby(c => c).where(c => c.count() > 1).select(c => new { charname = c.key, charcount = c.count()});

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