Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.IO;

namespace ConsoleApp1
{
	class Program
	{
		static void Main(string[] args)
		{
			try {
				using (StreamReader sr = new StreamReader(args[0])) {
					using (StreamWriter sw = new StreamWriter(args[0] + ".cs.txt")) {
						string line;
						while ((line = sr.ReadLine()) != null) {
							StringBuilder sb = new StringBuilder(line);

							for (int i = 0; i < sb.Length; ++i) {
								if (sb[i] == '"') {
									sb.Insert(i, '\\');
									++i;
								}
							}

							sb.Insert(0, "w.WriteLine(\"");
							sb.Append("\");");

							sw.WriteLine(sb.ToString());
						}
					}
				}
			}
			catch (IOException) {
				Console.WriteLine("Argument Error!");
			}
		}
	}
}