in Hands-on lab/lab-files/Tools/CustomerProfileJsonDataGenerator/StreamReaderExtensions.cs [10:22]
public static IEnumerable<string> ReadLines(this StreamReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
string line = null;
while ((line = reader.ReadLine()) != null)
{
yield return line;
}
}