WPF C# Combobox and XML serialization

See more:

C#

WPF

combobox

XmlSerializer

Hello everyone

I am working on a WPF project, where i want a user to be able to insert a string into a combobox (is set to IsEditable) and save the string into an XML file. At the same time the saved string/strings has to be shown when the combobox is dropped down (also when the project is closed and opened again). I have really tried to find a solution on the internet, but without luck. Can someone please help me. So far i have tried this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Xml.Serialization;
using System.IO;

namespace CIA
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonSaveServerName_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                XLMGetSet getset = new XLMGetSet();
                getset.serverName = ComboBoxServerName.Text;
                XMLSaveInputServer.SaveServerName(getset, "ServerNameFile.xml");
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void XML_load(object sender, EventArgs e)
        {
            if (File.Exists("ServerNameFile.xml"))
            {
                XmlSerializer xs = new XmlSerializer(typeof(XLMGetSet));
                FileStream read = new FileStream("ServerNameFile.xml", FileMode.Open, FileAccess.Read, FileShare.Read);
                XLMGetSet getset = (XLMGetSet)xs.Deserialize(read);
                ComboBoxServerName.Text = getset.serverName;
            }
        }

        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CIA
{
    public class XLMGetSet
    {
        private string ServerName;

        public string serverName
        {
            get { return ServerName; }
            set { ServerName = value; }
        }
        
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;
using System.IO;

namespace CIA
{
    public class XMLSaveInputServer
    {
        public static void SaveServerName(object obj, string ServerNameFile)
        {
            XmlSerializer sr = new XmlSerializer(obj.GetType());
            TextWriter write = new StreamWriter(ServerNameFile);
            sr.Serialize(write, obj);
            write.Close();
        }
    }
}