using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public void Main()

    {             

        string contents = "Foo=\" \" Bar=\"\" OrderDate=\"11/7/2010 19:31\" OrderNumber=\"090181809\" OrderAmount=\"50404.04\" BillTo=\"Customer\" BillToAddr1=\"123 BAR DR\" BillToAddr2=\"PO BOX 111\" BillToAddr3=\"\" BillToCity=\"NEW YORK\" BillToState=\"NY\" BillToPostalCode=\"42002\" BillToCntry=\"US\" BillToLat=\"39.99\" BillToLong=\"-34.73\" ShipTo=\"BAR\" ShipToAddr1=\"123 BAR LANE\"  ShipDate=\"1/9/2015\" ForeignDuty=\"True\" MixNuts=\"False\"  ";

        foreach (var item in CreatePairs(contents))

        {

           Console.WriteLine(item.Key + ":'" + item.Val + "'");

        }       

    }   

    public static IEnumerable<Pair> CreatePairs(string contents)

    {

       contents = contents.Replace("\" ", "\"|").Replace("=\"|\"", "=\" \"");//allow for a clean Split by separating items with pipe. The 2nd Replace is to cover case of whitespace.

       foreach (var item in contents.Split('|').Where(x=>x.Trim().Length>0))

       {

          var vals = item.Split('=');

          yield return new Pair { Key = vals[0].Trim(), Val = vals[1].TrimStart('"').TrimEnd('"') };

       }

    }   

}

​

public class Pair

{

    public string Key{get;set;}

    public string Val{get;set;}

}

​

​