StringEscape.cs

using System.Text;

namespace StringEscape
{
    public static class StringEscape
    {
        public static string Escape(string input)
        {
            var sb = new StringBuilder();
            //sb.Append("\"");
            foreach (var c in input)
            {
                switch (c)
                {
                    case '\t': sb.Append("\\t"); break;
                    case '\r': sb.Append("\\r"); break;
                    case '\n': sb.Append("\\n"); break;
                    default: sb.Append(c); break;
                }
            }
            //sb.Append("\"");

            return sb.ToString();
        }
    }
}