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Basically, you want to find the substringCountth occurrence of '_' in the string, and return all the characters before that.

Basing on the code from http://stackoverflow.com/a/11363213/1108056

private int IndexOfNth(string str, char c, int n)
{
 int index = -1;
 while (n-- > 0)
 {
 index = str.IndexOf(c, index + 1);
 if (index == -1) break;
 }
 return index;
}
public string GetSubstring(string input, int count, char delimiter)
{
 return input.Substring(0,IndexOfNth(input, delimiter, count));
}

Basically, you want to find the substringCountth occurrence of '_' in the string, and return all the characters before that.

Basing on the code from https://stackoverflow.com/a/11363213/1108056

private int IndexOfNth(string str, char c, int n)
{
 int index = -1;
 while (n-- > 0)
 {
 index = str.IndexOf(c, index + 1);
 if (index == -1) break;
 }
 return index;
}
public string GetSubstring(string input, int count, char delimiter)
{
 return input.Substring(0,IndexOfNth(input, delimiter, count));
}