int counter = 0;
string line;

// Read the file and display it line by line.
System.IO.StreamReader file =
    new System.IO.StreamReader(@"c:test.txt");
while((line = file.ReadLine()) != null)
{
    System.Console.WriteLine(line);
    counter++;
}

file.Close();
System.Console.WriteLine("There were {0} lines.", counter);
// Suspend the screen.
System.Console.ReadLine();