Counts the number of lines in a text file

CountLinesInTextFile.cs

// 4.0
var lineCount = File.ReadLines(@"C:\file.txt").Count();

// pre-4.0

var lineCount = File.ReadAllLines(@"C:\file.txt").Length;

// pre-4.0 (more efficient)
var lineCount = 0;
using (var reader = File.OpenText(@"C:\file.txt"))
{
    while (reader.ReadLine() != null)
    {
        lineCount++;
    }
}

Taken from https://stackoverflow.com/questions/119559/determine-the-number-of-lines-within-a-text-file