using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Serialization;

using System.IO;

using System.Diagnostics;

using System.Xml;

using System.Xml.Linq;

​

​

    public class TestClass

    {

        public static string GetXml()

        {

            string xml = @"<?xml version=""1.0"" encoding=""utf-8""?>

<ArrayOfQMXINVQ_INVENTORYType xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"">

<QMXINVQ_INVENTORYType>

    <ABCTYPE>C</ABCTYPE>

    <BINNUM>A-5-2</BINNUM>

    <FREQUNIT />

    <GLACCOUNT>

        <VALUE>????-???-200</VALUE>

        <GLCOMP

            glorder=""2"">200</GLCOMP>

    </GLACCOUNT>

    <INVENTORYID>140</INVENTORYID>

    <INVGENTYPE />

    <ISSUEUNIT>EACH</ISSUEUNIT>

    <VENDOR>ATI</VENDOR>

    <INVBALANCES>

        <BINNUM>A-5-2</BINNUM>

                    <CURBAL>6</CURBAL>

        <STAGEDCURBAL>0</STAGEDCURBAL>

        <STAGINGBIN>false</STAGINGBIN>

    </INVBALANCES>

    <ITEM>

        <DESCRIPTION>Connecting Link - Repair</DESCRIPTION>

        <EXTERNALREFID />

        <GROUPNAME />

        <ISSUEUNIT />

        <ITEMID>175</ITEMID>

        <ITEMTYPE>ITEM</ITEMTYPE>

        <LOTTYPE

            maxvalue=""NOLOT"">NOLOT</LOTTYPE>

    </ITEM>

</QMXINVQ_INVENTORYType>

<QMXINVQ_INVENTORYType>

    <ABCTYPE>C</ABCTYPE>

    <BINNUM>B-8-1</BINNUM>

    <FREQUNIT />

    <GLACCOUNT>

        <VALUE>????-???-300</VALUE>

        <GLCOMP

            glorder=""2"">300</GLCOMP>

    </GLACCOUNT>

    <INVENTORYID>142</INVENTORYID>

    <INVGENTYPE />

    <ISSUEUNIT>EACH</ISSUEUNIT>

    <VENDOR>ATI</VENDOR>

    <INVBALANCES>

        <BINNUM>B-8-1</BINNUM>

                    <CURBAL>5</CURBAL>

        <STAGEDCURBAL>0</STAGEDCURBAL>

        <STAGINGBIN>false</STAGINGBIN>

    </INVBALANCES>

    <ITEM>

        <DESCRIPTION>Fence Stretcher</DESCRIPTION>

        <EXTERNALREFID />

        <GROUPNAME />

        <ISSUEUNIT />

        <ITEMID>105</ITEMID>

        <ITEMTYPE>ITEM</ITEMTYPE>

        <LOTTYPE

            maxvalue=""NOLOT"">NOLOT</LOTTYPE>

    </ITEM>

  </QMXINVQ_INVENTORYType>

</ArrayOfQMXINVQ_INVENTORYType>";

            return xml;

        }

​

        public static void Test()

        {

            var xml = GetXml(); // Your sample XML as a string

​

            int topLevelElementIndex = 1;

            var topLevelElementName = "QMXINVQ_INVENTORYType";

​

            try

            {

                using (var sr = new StringReader(xml)) // You would use e.g. var sr = new StreamReader(strRespFile, Encoding.Encoding.UTF8)

                using (var reader = XmlReader.Create(sr))

                {

                    // Move to ROOT Element

                    reader.MoveToContent();

                    Debug.Assert(reader.Name == "ArrayOfQMXINVQ_INVENTORYType"); // No assert.

​

                    // Read to first CHILD Element of the root

                    reader.Read(); // Read to the first child NODE of the root element

                    reader.MoveToContent(); // If that node is whitespace, skip to content.

​

                    // Read to the FIRST array element of the desired name.

                    if (reader.Name != topLevelElementName)

                        if (!reader.ReadToNextSibling(topLevelElementName))

                            throw new InvalidOperationException("Not enough elements named " + topLevelElementName);

                    // Now read to the Nth element of the desired name.

                    for (int i = topLevelElementIndex; i > 0; i--)

                        if (!reader.ReadToNextSibling(topLevelElementName))

                            throw new InvalidOperationException("Not enough elements named " + topLevelElementName);

​

                    // Process the Nth element as desired.

                    Debug.Assert(reader.NodeType == XmlNodeType.Element && reader.Name == topLevelElementName);

                    using (var subReader = reader.ReadSubtree())

                    {

                        var element = XElement.Load(subReader);

                        // If each individual array element has manageable size, the easiest way to parse it is to load it into

                        // an XElement with a nested reader, then use Linq to XML

                        if (element.Descendants("BINNUM").Select(e => (string)e).FirstOrDefault() != "B-8-1")

                        {

                            Debug.Assert(element.Descendants("BINNUM").Select(e => (string)e).FirstOrDefault() == "B-8-1"); // No assert.

                            throw new InvalidOperationException();

                        }

                        Console.WriteLine(element.ToString());

                    }

                }

            }

            catch (Exception ex)

            {

                // Handle errors in the file however you like.

                Debug.WriteLine(ex);

                throw;

            }

        }

    }

​

public class Program

{

    public static void Main()

    {

        TestClass.Test();

    }

}

​