Problem med att söka igenom en xml-fil, C#

private void buttonSearch_Click(object sender, EventArgs e)
{
string path = @C:\Users\A\Documents\Visual Studio 2015\Projects\Inlamning1\Inlamning1;
XmlDocument doc = new XmlDocument();
doc.Load(path + "\\AdressBook\\settings.xml");
XmlElement elmRoot = doc.DocumentElement;
var id = TxtBoxSearch.Text;
string xPath = "//Person[@Name='" + id + "']";
XmlNode findnode = elmRoot.SelectSingleNode(xPath);

foreach (XmlElement node in findnode)
{
MessageBox.Show(node.InnerText);
}
}

<Names>
    <Name>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
    </Name>
    <Name>
        <FirstName>James</FirstName>
        <LastName>White</LastName>
    </Name>
</Names>

XmlDocument xml = new XmlDocument();
xml.LoadXml(myXmlString); // suppose that myXmlString contains "<Names>...</Names>"

XmlNodeList xnList = xml.SelectNodes("/Names/Name");
foreach (XmlNode xn in xnList)
{
    string firstName = xn["FirstName"].InnerText;
    string lastName = xn["LastName"].InnerText;
    Console.WriteLine("Name: {0} {1}", firstName, lastName);
}

private void button1_Click(object sender, EventArgs e)
{
    XmlDocument doc = new XmlDocument();
    string path = @"C:\Users\MeanME\Documents\Projects\CSharp\NameFile.xml";
    doc.Load(path);
    string id = textBox1.Text;
          
    foreach (XmlElement node in doc.DocumentElement) // Här det vart fel för dig.
    {
        if(String.Equals(node.InnerText.ToString(), id.ToString()))
        MessageBox.Show(node.InnerText);
    }
}

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

<Names>
    <Name>
        <FirstName>Anders</FirstName>
        <LastName> Andersson</LastName>
    </Name>
    <Name>
        <FirstName>Leif</FirstName>
        <LastName> Pettersson</LastName>
    </Name>
    <Name>
        <FirstName>Sven</FirstName>
        <LastName> Lindström</LastName>
    </Name>
    <Name>
        <FirstName>Leif</FirstName>
        <LastName> Björk</LastName>
    </Name>
</Names>