c# - importing xml file

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C#

XML

ListView

In my project I have got a listview filled with contacts which are stored in a XML file and this is the connection between the two of these. Basically this is how the contacts are loaded:

Please note that first function is called on form loading:

void LoadContacts()
    {
        string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
        string phonebook_path = path + "\\Phonebook\\Contacts.xml";
        if (!File.Exists(phonebook_path))
        {
            XmlTextWriter xW = new XmlTextWriter(phonebook_path, Encoding.UTF8);
            xW.WriteStartElement("People");
            xW.WriteEndElement();
            xW.Close();
        }
        XmlDocument xDoc = new XmlDocument();
        xDoc.Load(phonebook_path);
        foreach (XmlNode xNode in xDoc.SelectNodes("People/Person"))
        {
            Person p = new Person();
            p.Name = xNode.SelectSingleNode("Name").InnerText;
            p.Hometown = xNode.SelectSingleNode("Hometown").InnerText;
            p.Address = xNode.SelectSingleNode("Address").InnerText;
            p.Birthday = DateTime.FromFileTime(Convert.ToInt64(xNode.SelectSingleNode("Birthday").InnerText));
            p.Phone = xNode.SelectSingleNode("Phone").InnerText;
            p.Email = xNode.SelectSingleNode("Email").InnerText;
            p.AdditionalInfo = xNode.SelectSingleNode("AdditionalInfo").InnerText;
            people.Add(p);
            listView1.Items.Add(p.Name);
            UserCount();
        }
    }

and then the other one on form closing:

private void Main_FormClosing(object sender, FormClosingEventArgs e)
    {
        XmlDocument xDoc = new XmlDocument();
        string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
        string phonebook_path = path + "\\Phonebook\\Contacts.xml";
        xDoc.Load(phonebook_path);
        XmlNode xNode = xDoc.SelectSingleNode("People");
        xNode.RemoveAll();
        foreach (Person p in people)
        {
            XmlNode xTop = xDoc.CreateElement("Person");
            XmlNode xName = xDoc.CreateElement("Name");
            XmlNode xHometown = xDoc.CreateElement("Hometown");
            XmlNode xAddress = xDoc.CreateElement("Address");
            XmlNode xBirthday = xDoc.CreateElement("Birthday");
            XmlNode xPhone = xDoc.CreateElement("Phone");
            XmlNode xEmail = xDoc.CreateElement("Email");
            XmlNode xAdditionalInfo = xDoc.CreateElement("AdditionalInfo");
            xName.InnerText = p.Name;
            xHometown.InnerText = p.Hometown;
            xAddress.InnerText = p.Address;
            xBirthday.InnerText = p.Birthday.ToFileTime().ToString();
            xPhone.InnerText = p.Phone;
            xEmail.InnerText = p.Email;
            xAdditionalInfo.InnerText = p.AdditionalInfo;
            xTop.AppendChild(xName);
            xTop.AppendChild(xHometown);
            xTop.AppendChild(xAddress);
            xTop.AppendChild(xBirthday);
            xTop.AppendChild(xPhone);
            xTop.AppendChild(xEmail);
            xTop.AppendChild(xAdditionalInfo);
            xDoc.DocumentElement.AppendChild(xTop);
        }

        xDoc.Save(phonebook_path);
        Sync();
        SetStartup();
    }

I have got an option to import the XML file via method Import() which is called when a button is clicked.
void Import()
    {
        Main f1 = new Main();
        OpenFileDialog BrowseFile = new OpenFileDialog();
        if (BrowseFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            Properties.Settings.Default.ImportPath = BrowseFile.FileName;
        }
        string fileName = "Contacts.xml";
        string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
        string sourcePath = Properties.Settings.Default.ImportPath;
        string targetPath = path + "\\Phonebook\\";
        string destFile = System.IO.Path.Combine(targetPath, fileName);
        System.IO.File.Copy(sourcePath, destFile, true); 
        MessageBox.Show("Contacts have successfully been imported. Please restart your application in order changes to take effect!", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }

...Importing is performed perfectly which means I can see the copied XML file in the right place, but when I close the application, all of a sudden XML file turns into previous state somehow which means changes didn't take effect - when I load the app again, there will be no imported contacts.

How can I solve this issue?