Remove text after a string occurrence

Question

I have a string that has the following format:

string sample = \"A, ABC, 1, ACS,,\"

As you can see, there are 5 occurences of the ,

Answer 1

If you use the GetNthIndex method from this question, you can use String.Substring:

public int GetNthIndex(string s, char t, int n)
{
    int count = 0;
    for (int i = 0; i < s.Length; i++)
    {
        if (s[i] == t)
        {
            count++;
            if (count == n)
            {
                return i;
            }
        }
    }
    return -1;
}

So you could do the following:

string sample = "A, ABC, 1, ACS,,";
int index = GetNthIndex(sample, ',', 4);
string result = sample.Substring(0, index);