It’s easy to read a string one line at a time.  Here is a console program that demonstrates how:

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using System;
using System.IO;
 
namespace CSharp411
{
    class Program
    {
        static void Main( string[] args )
        {
            string text = "HellonGoodbye, worldnnDon't have a cow";
            using (StringReader reader = new StringReader( text ))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    Console.WriteLine( line );
                }
            }
            Console.ReadLine();
        }
    }
}