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not synchronized.
DataSource Column Assignment
You may have noticed in "What Data Can I Bind" above that DisplayMember is not always specified. If the data 
only has a single member, the data is displayed. Types other than string can also be displayed automatically, 
e.g. an array of DateTime values:
You can find the complete source for this project at:
\VS Projects\DataBinding\VB|CS\Introduction
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Let's take one more look at a very simple "Product" object that contains an integer ID and Description string.
If we create a list of products and bind to a RadControl without specifying a DisplayMember...
[VB] Automatically Assigning Columns
Dim arr As DateTime() = {DateTime.Today.AddDays(-1), DateTime.Today, 
DateTime.Today.AddDays(1)}
radListBox1.DataSource = arr 
[C#] Automatically Assigning Columns
DateTime[] arr = { DateTime.Today.AddDays(-1), DateTime.Today, 
DateTime.Today.AddDays(1) };
radListBox1.DataSource = arr;  
[VB] The Product Class
Public Class Product
Public Sub New(id As Integer, description As String)
ID = id
Description = description
End Sub
Public Property ID() As Integer
Get
End Get
Set
End Set
End Property
Public Property Description() As String
Get
End Get
Set
End Set
End Property
End Class 
[C#] The Product Class
public class Product
{
public Product(int id, string description)
{
ID = id;
Description = description;
}
public int ID
getset; }
public string Description
getset; }
[VB] Binding the Products List
Dim products As New List(Of Product)()
products.Add(New Product(1, "Jute Heather Cardigan"))
products.Add(New Product(2, "Retro Cardigan"))
products.Add(New Product(3, "Cashmere Cardigan"))
radListBox1.DataSource = products 
[C#] Binding the Products List
List<Product> products = new List<Product>();
products.Add(new Product(1, "Jute Heather Cardigan"));
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RadControls for Winforms
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...the Product objectname will be displayed for each record as a string:
Now with the addition of DisplayMember...
...the Product "Description" column shows up in the list.
The ValueMember column is available whenever we access an item and examine the Value property. For 
example, if we add a SelectedIndexChange event handler to the RadListBox...
...we can extract the Value property:
products.Add(new Product(2, "Retro Cardigan"));
products.Add(new Product(3, "Cashmere Cardigan"));
radListBox1.DataSource = products;
[VB] Binding the Products With DisplayMember
Dim products As New List(Of Product)()
products.Add(New Product(1, "Jute Heather Cardigan"))
products.Add(New Product(2, "Retro Cardigan"))
products.Add(New Product(3, "Cashmere Cardigan"))
radListBox1.DataSource = products
radListBox1.DisplayMember = "Description"
radListBox1.ValueMember = "ID"
[C#] Binding the Products With DisplayMember
List<Product> products = new List<Product>();
products.Add(new Product(1, "Jute Heather Cardigan"));
products.Add(new Product(2, "Retro Cardigan"));
products.Add(new Product(3, "Cashmere Cardigan"));
radListBox1.DataSource = products;
radListBox1.DisplayMember = "Description";
radListBox1.ValueMember = "ID";
[VB] Retrieving the Value Property
Private Sub radListBox1_SelectedIndexChanged(sender As Object, e As EventArgs)
Dim item As RadListBoxItem = TryCast((TryCast(sender, RadListBox)).SelectedItem, 
RadListBoxItem)
RadMessageBox.Show([String].Format("Text: {0} Value: {1}", item.Text, item.Value))
End Sub
[C#] Retrieving the Value Property
private void radListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
RadListBoxItem item = (sender as RadListBox).SelectedItem as RadListBoxItem;
RadMessageBox.Show(String.Format("Text: {0}  Value: {1}", item.Text, item.Value));
}
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Interacting with Bound Data
When you want the ability to add, update and delete bound data, use an implementation of IBindingList such 
as BindingList<> or BindingSource.
The objects that populate the IBindingList should implement the INotifyPropertyChanged interface. 
INotifyPropertyChanged supports the ListChanged event of BindingList and automatically refreshes bound 
controls, such as RadGridView, RadListBox, etc. To implement INotifyPropertyChanged you only need to add a 
PropertyChanged event.
The event is triggered from the "setter" of your properties after checking that the event handler is not null.
Here's a minimal example that shows add, update and delete in a BindingList of objects, and where the 
You can find the complete source for this project at:
\VS Projects\DataBinding\VB|CS\BindingList
[VB] Class with INotifyPropertyChanged
Class [MyClass]
Implements INotifyPropertyChanged
#region INotifyPropertyChanged Members
Public Event PropertyChanged As PropertyChangedEventHandler
#End Region
End Class
[C#] Class with INotifyPropertyChanged
class MyClass : INotifyPropertyChanged
{
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
[VB] Triggering the Event
If PropertyChanged <> Nothing Then
PropertyChanged(MeNew PropertyChangedEventArgs("MyPropertyName"))
End If
[C#] Triggering the Event
if (PropertyChanged != null)
{
PropertyChanged(thisnew PropertyChangedEventArgs("MyPropertyName"));
}
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object implements INotifyPropertyChanged. Notice that the grid is never explicitly refreshed, yet changes to 
the BindingList are immediately apparent.
[VB] Using BindingList and INotifyPropertyChanged
Imports System
Imports System.ComponentModel
Imports System.Windows.Forms
Namespace BindingList
Public Partial Class Form1
Inherits Form
Public Sub New()
InitializeComponent()
End Sub
' BindingList to contain list of MyObject
Private _myObjects As BindingList(Of MyObject)
Private Sub Form1_Load(sender As Object, e As EventArgs)
' instantiate _myObjects and assign to gridview datasource
_myObjects = New BindingList(Of MyObject)()
radGridView1.DataSource = _myObjects
End Sub
Private Sub btnAdd_Click(sender As Object, e As EventArgs)
' newly added MyObject shows up automatically in the grid
_myObjects.Add(New MyObject())
End Sub
Private Sub btnUpdate_Click(sender As Object, e As EventArgs)
' updated MyObject TimeStamp property shows up automatically in the grid
If radGridView1.CurrentRow <> Nothing Then
Dim currentObject As MyObject = TryCast(radGridView1.CurrentRow.DataBoundItem, 
MyObject)
currentObject.TimeStamp = DateTime.Now
End If
End Sub
Private Sub btnDelete_Click(sender As Object, e As EventArgs)
' deleted MyObject displays automatically in the grid
If radGridView1.CurrentRow <> Nothing Then
Dim currentObject As MyObject = TryCast(radGridView1.CurrentRow.DataBoundItem, 
RadControls for Winforms
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RadControls for Winforms
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MyObject)
_myObjects.Remove(currentObject)
End If
End Sub
End Class
' MyObject implements INotifyPropertyChanged.
' The object has a single property "TimeStamp". When
' TimeStamp is modified, PropertyChanged is fired
Public Class MyObject
Implements INotifyPropertyChanged
Public Sub New()
_timeStamp = DateTime.Now
End Sub
Private _timeStamp As DateTime
Public Property TimeStamp() As DateTime
Get
Return _timeStamp
End Get
Set
_timeStamp = value
If PropertyChanged <> Nothing Then
PropertyChanged(MeNew PropertyChangedEventArgs("TimeStamp"))
End If
End Set
End Property
Public Event PropertyChanged As PropertyChangedEventHandler
End Class
End Namespace
[C#] Using BindingList and INotifyPropertyChanged
using System;
using System.ComponentModel;
using System.Windows.Forms;
namespace BindingList
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
// BindingList to contain list of MyObject
private BindingList<MyObject> _myObjects;
private void Form1_Load(object sender, EventArgs e)
{
// instantiate _myObjects and assign to gridview datasource
_myObjects = new BindingList<MyObject>();
radGridView1.DataSource = _myObjects;       
}
private void btnAdd_Click(object sender, EventArgs e)
{
// newly added MyObject shows up automatically in the grid
_myObjects.Add(new MyObject());
}
private void btnUpdate_Click(object sender, EventArgs e)
{
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This project demonstrates binding a RadListBox to database data in the Albums table of the 
MusicCollection.mdb file that ships with RadControls for WinForms. You can follow these basic steps whenever 
you connect to database data at design time.
// updated MyObject TimeStamp property shows up automatically in the grid
if (radGridView1.CurrentRow != null)
{
MyObject currentObject = radGridView1.CurrentRow.DataBoundItem as MyObject;
currentObject.TimeStamp = DateTime.Now;
}
}
private void btnDelete_Click(object sender, EventArgs e)
{
// deleted MyObject displays automatically in the grid
if (radGridView1.CurrentRow != null)
{
MyObject currentObject = radGridView1.CurrentRow.DataBoundItem as MyObject;
_myObjects.Remove(currentObject);
}
}
}
// MyObject implements INotifyPropertyChanged.
// The object has a single property "TimeStamp". When
// TimeStamp is modified, PropertyChanged is fired
public class MyObject : INotifyPropertyChanged
{
public MyObject()
{
_timeStamp = DateTime.Now;
}
private DateTime _timeStamp;
public DateTime TimeStamp
{
get
{
return _timeStamp;
}
set
{
_timeStamp = value;
if (PropertyChanged != null)
{
PropertyChanged(thisnew PropertyChangedEventArgs("TimeStamp"));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
9.3  Getting Started
You can find the complete source for this project at:
\VS Projects\Databinding\VB|CS\GettingStarted
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1. In a new Windows Forms Application, drop a RadListBox on the default form. 
2. Drop down the Properties window editor for the DataSource property and click the Add Project Data 
Source... link.
This step will display the Data Source Configuration Wizard where you can connect to database data, 
business objects or services.
3. In the Data Source Configuration Wizard "Choose a Data Source Type" page, select the Database icon and 
click Next to continue.
4. In the "Choose Your Data Connection" page, click the New Connection button.
This will display the Add Connection dialog. Note that you can also select an existing connection if you 
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RadControls for Winforms
have already been through the configuration process and have a configuration that matches your needs. 
The Add Connection dialog will help us describe the kind of data (SQL Server, Access, etc.) and the 
location of the data. In the RadControls for WinForms installation directory you can find a series of Access 
(*.mdb) files in the /Examples/Datasources subdirectory. You can just as easily connect to SQL Server or 
other enterprise level data.
5. In the Add Connection dialog:
If the Data Source doesn't list "Microsoft Access Database File", then click the Change button, select it 
from the list in the Change Data Source dialog and click OK.
Click the Browse... button and navigate to the RadControls for WinForms installation directory, locate 
the \Examples\DataSources directory and select the MusicCollection.mdb file.
Click OK to close the Add Connection dialog.
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RadControls for Winforms
6. In the Data Source Configuration Wizard "Choose Your Data Connection" page, click Next to continue.
7. A dialog will display asking if you want to copy this file locally. Select No to reference the database file in 
its original location.
8. In the "Choose Database Objects" page of the wizard, open up the treeview and select the tables and fields 
you want to include in your data source.
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RadControls for Winforms
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