Databinding object to a Windows Form

Project type is Windows forms application.

I have the following issue:

I want to unit test my GUI as far as I can, thus I wrote:

Code:

---

namespace Presentation
{
        public class LoginForm : INotifyPropertyChanged
        {
                private string _password = string.Empty;

                // Declares an event to fire, should we want to report that a property has changed
                public event PropertyChangedEventHandler PropertyChanged;


                // Case sensitive comparison is performed on the password prior to setting the new value
                public string Password
                {
                        get { return _password; }
                        set
                        {
                                if( string.Compare( _password, value, false ) != 0 )
                                {
                                        _password = value;
                                        if( PropertyChanged != null )
                                        {
                                                PropertyChanged( this, new PropertyChangedEventArgs( "Password" ) );
                                        }
                                }
                        }
                }


                public bool OkButtonEnabled
                {
                        get
                        {
                                return ! ( string.IsNullOrEmpty( Username ) || string.IsNullOrEmpty( Password ) );
                        }
                }
        }
}

---

(Code chopped for legibility)

Now, I have a corresponding windows form that I want to use this class with, I create the button and text box, and find the databinding controls.

The first time that I reference it, I am asked to create a data binding source, no problem, I navigate through the namespaces and end up with a loginFormBindingSource object.

Then I proceed. In properties for the Password, I bind the text property to the loginFormBindingSource's Password property.

For the button, I go to "advanced" and choose to bind the "Enabled" property to the "OkButtonEnabled" property in the binding source.

Compiling and running is without error, however, the data binding does not work. I must be missing something important, like a constructor, so I tried
to initialize the binding source, but to no avail.

If I remove all GUI bindings and instead opt to bind manually in the form's constructor like this:

Code:

---

public partial class Form1 : Form
{
        LoginForm codeBehindLoginForm        = new LoginForm( );

        public Form1()
        {
                InitializeComponent();

                                       
                tbPassword.DataBindings.Add        ( "Text",        codeBehindLoginForm, "Password" );
                btnOk.DataBindings.Add                ( "Enabled", codeBehindLoginForm, "OkButtonEnabled" );                       
        }
}

---

...then everything works as expected.

Can anyone please enlighten me as to how I can get the GUI binding, using properties to work? I am almost sure that the only thing missing is some form of initalization, I'm just not sure where. A search here, and on google returns only examples of binding to data sources.
In advance, thanks for reading.

Hmm, a collegue of mine heard my frustration and offered me the solution:


Even though the loginFormBindingSource is created and specified in GUI, it is not initialized automatically in codebehind, so the missing thing was this:

Code:

---

                public Form1()
                {
                        InitializeComponent();

                        loginFormBindingSource.Add( new LoginForm( ) );
                }

---

Hoping someone else will find this useful :)