How to count the number of duplicate chars in a string

[keeponfalling]

I need to count the number of duplicate chars in a string:

aabbcc :
-a - 2
-b - 2
-c - 2

or : aaab - - 2; b - 1;

Any hint please, I'm stuck. Thanks

I try this:

foreach(char c in p1)
{
int index = text.IndexOf(c);

if (c == text[index])
{

count++;
}
if(c != text[index])
{
countsinglenumbers++;
}
a++;
}

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