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How to find nth occurence of a character in a string without using LINQ

Did you try anything?

It would be a simple for loop with an if. Something like:
public int GetNthOccurenceIndex(string sample, char t, int nth)
    int count = 0;
    for (int i = 0; i < sample.Length; i++)
        if (sample[i] == t)
            if (count == nth)
               return i;
    // -1 means nth occurrence was not found.
    return -1;
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MatchCollection mc = Regex.Matches(strList, c.ToString());
if (mc.Count >= numCount)
result = mc[numCount - 1].Index;
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