using System;

using System.Xml;

public class Program

{

    public static void Main()

    {

        var xmlDoc = new XmlDocument();

        xmlDoc.InnerXml = @"<Main>

            <Person>

                <Name>Božena</Name>

                <Surname>Němcová</Surname>

                <Gender>Female</Gender>

                <OrderNum>18</OrderNum>

                <BirthDate>04.02.1820</BirthDate>

            </Person>

            <Person>

                <Name>Jan</Name>

                <Surname>Žižka</Surname>

                <Gender>Male</Gender>

                <OrderNum>7</OrderNum>

                <BirthDate>19.09.1360</BirthDate>

            </Person>

            <Person>

                <Name>Che</Name>

                <Surname>Guevara</Surname>

                <Gender>Male</Gender>

                <OrderNum>27</OrderNum>

                <BirthDate>14.06.1928</BirthDate>

            </Person>

            <Person>

                <Name>Antonie</Name>

                <Surname>de Saint-Exupéry</Surname>

                <Gender>Male</Gender>

                <OrderNum>15</OrderNum>

                <BirthDate>29.06.1900</BirthDate>

            </Person>

        </Main>";

        XmlNodeList data = xmlDoc.SelectNodes("Main/Person/Name");

        Console.WriteLine(data.Count);

​

    }

}