Winforms .Net Simple Databinding Not Working

Question

I have a Winform with a very basic premise: modify 2 string properties of an object that is passed into it, then save it to disk when the form closes. I am trying to use databinding to bind the Text properties of 2 textboxes on the form to the 2 string properties of the object.

But it isn't working. The textboxes never display the values I am assigning to the object properties in the constructor. And when I type something into the textboxes, the object properties are not getting updated. What am I doing wrong?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
namespace Eds_Viewer
{
    public partial class EdsConfigForm : Form
    {
     public EdsConfigForm(EdsConfig myconfig)
     {
      InitializeComponent();
      EdsConfig = myconfig;
      if (EdsConfig.VFPConnectionString == null) //set a default value
      {
       EdsConfig.VFPConnectionString = "Provider=vfpoledb;Data Source=g:\\eds\\";
      }
      if (EdsConfig.VFPFileName == null) //set a default value
      {
       EdsConfig.VFPFileName = "InvoiceDB";
      }
      this.VFPConnectionStringTextbox.DataBindings.Add("Text", EdsConfig, "VFPConnectionString");
      this.VFPFileNameTextbox.DataBindings.Add("Text", EdsConfig, "VFPFileName");
     }
     EdsConfig EdsConfig;
     private void SaveConfigToDisk(EdsConfig myconfig)
     {
      XmlSerializer x = new XmlSerializer(typeof(EdsConfig));
      TextWriter tw = new StreamWriter("EdsConfig.xml");
      x.Serialize(tw, myconfig);
      tw.Close();
     }
     private void EdsConfigForm_FormClosing(object sender, FormClosingEventArgs e)
     {
      this.SaveConfigToDisk(this.EdsConfig);
     }
    }
}

Answer 1

Does the EdsConfig class implement the INotifyPropertyChanged interface?
This is a requirement for objects that are used as databinding sources, since the PropertyChanged event raised from the properties' setters is used to update the bindings whenever the property is modified.

Answer 2

Are VFPFileName and VFPConnectionString properties, or simply public fields ?

Answer 3

Set the DataSource argument in "DataBindings.Add(..)" to "bs"(of type BindingSource)

    BindingSource bs = new BindingSource(EdsConfig, "VFPConnectionString");
    this.VFPConnectionStringTextbox.DataBindings.Add("Text", bs, "VFPConnectionString");
    this.VFPFileNameTextbox.DataBindings.Add("Text", bs, "VFPFileName");