The following code shows you how to count lines in file. Reading a text from file line by line and checking until the file ends and adding plus one to counter.
using System.IO;
public void CountLines(string filePath)
{
TextReader tr = File.OpenText(filePath);
int countLines = 0;
while (tr.ReadLine() != null)
{
countLines++;
}
Console.WriteLine(countLines.ToString());
}
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