using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var parsedValue = new List<List<String>>();

        var csv = "A\\B.csproj,\"X\\Y,.csproj\"";

        var parser = new Regex(@"(?<=\r|\n|^)(?!\r|\n|$)(?:(?:""(?<Value>(?:[^""]|"""")*)""|(?<Value>(?!"")[^,\r\n]+)|""(?<OpenValue>(?:[^""]|"""")*)(?=\r|\n|$)|(?<Value>))(?:,|(?=\r|\n|$)))+?(?:(?<=,)(?<Value>))?(?:\r\n|\r|\n|$)", RegexOptions.Compiled);

        foreach (Match match in parser.Matches(csv))

        {

            var currentRow = new List<String>();

            foreach (Capture capture in match.Groups["Value"].Captures)

            {

                if (capture.Length == 0 || capture.Index == match.Index || match.Value[capture.Index - match.Index - 1] != '\"')

                {

                    // No need to unescape/undouble quotes if the value is empty, the value starts at the beginning of the record, or the character before the value is not a quote (not a quoted value)

                    currentRow.Add(capture.Value);

                }

                else

                {

                    // The character preceding this value is a quote so we need to unescape/undouble any embedded quotes

                    currentRow.Add(capture.Value.Replace("\"\"", "\""));

                }

            }

​

            foreach (Capture OpenValue in match.Groups["OpenValue"].Captures)

            {

                // Ignoring values with open-ended quotes

            }

            parsedValue.Add(currentRow);

        }

        foreach (var row in parsedValue)

        {

            foreach (var _value in row)

            {

                Console.WriteLine(_value);

            }

        }

    }

}