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bool sentinelFound = false;
int count = 0;
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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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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