Counting within a loop

I need to count lines in a loop but I can't start counting the lines until my reader or writer sees a ST*.  Once the ST* is found, that would be the first count iteration.  Every line afterwards will be included in the count.  How would I do that?
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käµfm³d 👽Commented:
A bit of pseudo-code:

bool sentinelFound = false;
int count = 0;

while (linesRemaining)
    string line = readLine();

    if (line.Contains("ST*")) sentinelFound = true;

    if (sentinelFound) count++;

count--;  // If you need to ignore the line that has ST*; otherwise remove

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Or you could use LINQ:

int count = File.ReadLines(@"C:\path\to\your\file.txt")
                .SkipWhile(line => !line.Contains("ST*"))
                .Skip(1) // Ignore the line that contains ST*; if you need that line counted, then remove this line

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