---
title: "How to: Implement the IListSource Interface"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "data binding [Windows Forms], implementing"
  - "IListSource interface"
ms.assetid: 63ce27aa-2e23-4fbd-8228-0c1726f6c421
---
# How to: Implement the IListSource Interface
Implement the <xref:System.ComponentModel.IListSource> interface to create a bindable class that does not implement <xref:System.Collections.IList> but instead provides a list from another location.  
  
## Example  
 The following code example demonstrates how to implement the <xref:System.ComponentModel.IListSource> interface. A component named `EmployeeListSource` exposes an <xref:System.Collections.IList> for data binding by implementing the <xref:System.ComponentModel.IListSource.GetList%2A> method.  
  
 [!code-csharp[System.ComponentModel.IListSource#1](~/samples/snippets/csharp/VS_Snippets_Winforms/System.ComponentModel.IListSource/CS/EmployeeListSource.cs#1)]
 [!code-vb[System.ComponentModel.IListSource#1](~/samples/snippets/visualbasic/VS_Snippets_Winforms/System.ComponentModel.IListSource/VB/EmployeeListSource.vb#1)]  
  
 [!code-csharp[System.ComponentModel.IListSource#10](~/samples/snippets/csharp/VS_Snippets_Winforms/System.ComponentModel.IListSource/CS/Employee.cs#10)]
 [!code-vb[System.ComponentModel.IListSource#10](~/samples/snippets/visualbasic/VS_Snippets_Winforms/System.ComponentModel.IListSource/VB/Employee.vb#10)]  
  
 [!code-csharp[System.ComponentModel.IListSource#100](~/samples/snippets/csharp/VS_Snippets_Winforms/System.ComponentModel.IListSource/CS/BusinessObjectBase.cs#100)]
 [!code-vb[System.ComponentModel.IListSource#100](~/samples/snippets/visualbasic/VS_Snippets_Winforms/System.ComponentModel.IListSource/VB/BusinessObjectBase.vb#100)]  
  
 [!code-csharp[System.ComponentModel.IListSource#1000](~/samples/snippets/csharp/VS_Snippets_Winforms/System.ComponentModel.IListSource/CS/Form1.cs#1000)]
 [!code-vb[System.ComponentModel.IListSource#1000](~/samples/snippets/visualbasic/VS_Snippets_Winforms/System.ComponentModel.IListSource/VB/Form1.vb#1000)]  
  
## Compiling the Code  
 This example requires:  
  
- References to the System.Drawing and System.Windows.Forms assemblies.  
  
## See also

- <xref:System.ComponentModel.IListSource>
- <xref:System.ComponentModel.ITypedList>
- <xref:System.ComponentModel.BindingList%601>
- <xref:System.ComponentModel.IBindingList>
- [Data Binding and Windows Forms](data-binding-and-windows-forms.md)