docs-desktop/dotnet-desktop-guide/framework/wpf/data/how-to-create-and-bind-to-an-observablecollection.md

---
title: "How to: Create and Bind to an ObservableCollection"
description: Find out how to create and bind to a collection that derives from the ObservableCollection class in Windows Presentation Foundation.  
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "data binding [WPF], ObservableCollection class"
  - "notifications [WPF]"
ms.assetid: 6cf7e275-df76-41c6-a611-53b889b8fd5a
---
# How to: Create and Bind to an ObservableCollection
This example shows how to create and bind to a collection that derives from the <xref:System.Collections.ObjectModel.ObservableCollection%601> class, which is a collection class that provides notifications when items get added or removed.  
  
## Example  
 The following example shows the implementation of a `NameList` collection:  
  
```csharp  
public class NameList : ObservableCollection<PersonName>  
{  
    public NameList() : base()  
    {  
        Add(new PersonName("Willa", "Cather"));  
        Add(new PersonName("Isak", "Dinesen"));  
        Add(new PersonName("Victor", "Hugo"));  
        Add(new PersonName("Jules", "Verne"));  
    }  
  }  
  
  public class PersonName  
  {  
      private string firstName;  
      private string lastName;  
  
      public PersonName(string first, string last)  
      {  
          this.firstName = first;  
          this.lastName = last;  
      }  
  
      public string FirstName  
      {  
          get { return firstName; }  
          set { firstName = value; }  
      }  
  
      public string LastName  
      {  
          get { return lastName; }  
          set { lastName = value; }  
      }  
  }  
```  
  
```vb  
Public Class NameList  
    Inherits ObservableCollection(Of PersonName)  
  
    ' Methods  
    Public Sub New()  
        MyBase.Add(New PersonName("Willa", "Cather"))  
        MyBase.Add(New PersonName("Isak", "Dinesen"))  
        MyBase.Add(New PersonName("Victor", "Hugo"))  
        MyBase.Add(New PersonName("Jules", "Verne"))  
    End Sub  
  
End Class  
  
Public Class PersonName  
    ' Methods  
    Public Sub New(ByVal first As String, ByVal last As String)  
        Me._firstName = first  
        Me._lastName = last  
    End Sub  
  
    ' Properties  
    Public Property FirstName() As String  
        Get  
            Return Me._firstName  
        End Get  
        Set(ByVal value As String)  
            Me._firstName = value  
        End Set  
    End Property  
  
    Public Property LastName() As String  
        Get  
            Return Me._lastName  
        End Get  
        Set(ByVal value As String)  
            Me._lastName = value  
        End Set  
    End Property  
  
    ' Fields  
    Private _firstName As String  
    Private _lastName As String  
End Class  
```  
  
 You can make the collection available for binding the same way you would with other common language runtime (CLR) objects, as described in [Make Data Available for Binding in XAML](how-to-make-data-available-for-binding-in-xaml.md). For example, you can instantiate the collection in [!INCLUDE[TLA2#tla_xaml](../../../includes/tla2sharptla-xaml-md.md)] and specify the collection as a resource, as shown here:  
  
```xaml  
<Window  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
  xmlns:c="clr-namespace:SDKSample"  
  x:Class="SDKSample.Window1"  
  Width="400"  
  Height="280"  
  Title="MultiBinding Sample">  
  
  <Window.Resources>  
    <c:NameList x:Key="NameListData"/>  
  
...  
  
</Window.Resources>  
```  
  
 You can then bind to the collection:  
  
```xaml  
<ListBox Width="200"  
         ItemsSource="{Binding Source={StaticResource NameListData}}"  
         ItemTemplate="{StaticResource NameItemTemplate}"  
         IsSynchronizedWithCurrentItem="True"/>  
```  
  
 The definition of `NameItemTemplate` is not shown here.  
  
> [!NOTE]
> The objects in your collection must satisfy the requirements described in the [Binding Sources Overview](binding-sources-overview.md). In particular, if you are using <xref:System.Windows.Data.BindingMode.OneWay> or <xref:System.Windows.Data.BindingMode.TwoWay> (for example, you want your [!INCLUDE[TLA2#tla_ui](../../../includes/tla2sharptla-ui-md.md)] to update when the source properties change dynamically), you must implement a suitable property changed notification mechanism such as the <xref:System.ComponentModel.INotifyPropertyChanged> interface.  
  
 For more information, see the Binding to Collections section in the [Data Binding Overview](data-binding-overview.md).  
  
## See also

- [Sort Data in a View](how-to-sort-data-in-a-view.md)
- [Filter Data in a View](how-to-filter-data-in-a-view.md)
- [Sort and Group Data Using a View in XAML](how-to-sort-and-group-data-using-a-view-in-xaml.md)
- [Data Binding Overview](data-binding-overview.md)
- [How-to Topics](data-binding-how-to-topics.md)