using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Xml.Linq;

using System.Xml;

​

namespace ConsoleApplication1

{

    public class Program

    {

        private static string xmlStr = @"<data>

     <term>

        <courses>

            <course srcid=""012345"">

                <instructor srcid=""0123456""></instructor>

            </course>

            <course srcid=""123456"">

                <instructor srcid=""1234567""></instructor>

                <evaluations>

                    <evaluation decline=""false"" sequence_num=""0001"">

                        <response questionId=""32"">Yes</response>

                        <response questionId=""34"">4</response>

                        <response questionId=""35"">4</response>

                        <response questionId=""36"">4</response>

                        <response questionId=""37"">4</response>

                        <response questionId=""38"">4</response>

                        <response questionId=""39"">4</response>

                        <response questionId=""40"">3</response>

                        <response questionId=""41"">3</response>

                        <response questionId=""42"">3</response>

                        <response questionId=""43"">3</response>

                        <response questionId=""44"">-1</response>

                        <response questionId=""45"">-1</response>

                        <response questionId=""46"">3</response>

                        <response questionId=""47"">-1</response>

                        <response questionId=""48"">-1</response>

                        <response questionId=""49"">3</response>

                        <response questionId=""50"">4</response>

                    </evaluation>

                </evaluations>

            </course>

            <course srcid=""345678"">

                <instructor srcid=""3456789""></instructor>

                <evaluations>

                    <evaluation decline=""false"" sequence_num=""0002"">

                        <response questionId=""32"">NO</response>

                        <response questionId=""33"">YES</response>

                        <response questionId=""34"">4</response>

                        <response questionId=""35"">4</response>

                        <response questionId=""36"">4</response>

                        <response questionId=""37"">4</response>

                        <response questionId=""38"">4</response>

                        <response questionId=""39"">4</response>

                        <response questionId=""40"">4</response>

                        <response questionId=""41"">4</response>

                        <response questionId=""42"">4</response>

                        <response questionId=""43"">4</response>

                        <response questionId=""44"">4</response>

                        <response questionId=""45"">4</response>

                        <response questionId=""46"">4</response>

                        <response questionId=""47"">4</response>

                        <response questionId=""48"">4</response>

                        <response questionId=""49"">4</response>

                        <response questionId=""50"">4</response>

                        <response questionId=""51"">4</response>

                        <response questionId=""52"">4</response>

                        <response questionId=""53"">4</response>

                        <response questionId=""54"">4</response>

                        <response questionId=""55"">4</response>

                        <response questionId=""56"">4</response>

                    </evaluation>

                    <evaluation decline=""false"" sequence_num=""0003"">

                        <response questionId=""32"">YES</response>

                        <response questionId=""33"">YES</response>

                        <response questionId=""34"">3</response>

                        <response questionId=""35"">3</response>

                        <response questionId=""36"">4</response>

                        <response questionId=""37"">4</response>

                        <response questionId=""38"">4</response>

                        <response questionId=""39"">4</response>

                        <response questionId=""40"">4</response>

                        <response questionId=""41"">4</response>

                        <response questionId=""42"">4</response>

                        <response questionId=""43"">4</response>

                        <response questionId=""44"">4</response>

                        <response questionId=""45"">3</response>

                        <response questionId=""46"">4</response>

                        <response questionId=""47"">4</response>

                        <response questionId=""48"">4</response>

                        <response questionId=""49"">4</response>

                        <response questionId=""50"">3</response>

                        <response questionId=""51"">3</response>

                        <response questionId=""52"">4</response>

                        <response questionId=""53"">3</response>

                        <response questionId=""54"">4</response>

                        <response questionId=""55"">4</response>

                        <response questionId=""56"">4</response>

                    </evaluation>

                </evaluations>

            </course>

        </courses>

    </term>

</data>

";

        public static void Main(string[] args)

        {

            List<string> questions = new List<string>(){ "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "50", "51", "52", "53", "54", "55", "56" };

            XDocument xmldata = XDocument.Parse(xmlStr);

            foreach (var courseNode in xmldata.Root.Descendants("course"))

            {

                string course = (string) courseNode.Attribute("srcid").Value;

                string instructor = (string) courseNode.Element("instructor").Attribute("srcid").Value;

                int evaluationCount = 0;

                foreach (var evaluationNode in courseNode.Descendants("evaluation"))

                {

                    var eval = from answer in evaluationNode.Descendants("response")

                                     where questions.Contains(answer.Attribute("questionId").Value)

                                     select answer;

                    string output = course + instructor;

                    foreach (string answer in eval)

                        output += answer;

                    Console.Write(output + "\r\n");

                    ++evaluationCount;

                }

                if (evaluationCount == 0)

                {

                    Console.WriteLine(course + instructor);

                }

            }

            Console.ReadLine(); 

        }

    }

}