BindingSource.DataSource Property (System.Windows.Forms)

.NET Framework Class Library

BindingSource..::.DataSource Property

Gets or sets the data source that the connector binds to.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)

Syntax

Visual Basic (Declaration)

Public Property DataSource As Object

Visual Basic (Usage)

Dim instance As BindingSource
Dim value As Object

value = instance.DataSource

instance.DataSource = value

public Object DataSource { get; set; }

Visual C++

public:
property Object^ DataSource {
    Object^ get ();
    void set (Object^ value);
}

JScript

public function get DataSource () : Object
public function set DataSource (value : Object)

Property Value

Type: System..::.Object
An Object that acts as a data source. The default is nullNothingnullptra null reference (Nothing in Visual Basic).

Remarks

The DataSource property can be set to a number of data sources, including types, objects, and lists of types. The resulting data source will be exposed as a list. The following table shows some of the common data sources and the resulting list evaluation.

DataSource property	List results
nullNothingnullptra null reference (Nothing in Visual Basic)	An empty IBindingList of objects. Adding an item sets the list to the type of the added item.
nullNothingnullptra null reference (Nothing in Visual Basic) with DataMember set	Not supported, raises ArgumentException.
Non-list type or object of type "T"	Empty IBindingList of type "T".
Array instance	IBindingList containing the array elements.
IEnumerable instance	An IBindingList containing the IEnumerable items.
List instance containing type "T"	IBindingList instance containing type "T".

In addition, DataSource can be set to other list types such as IListSource and ITypedList and the BindingSource will handle them appropriately. In this case, the type contained in the list should have a default constructor.

When setting a data source, if the supplied reference contains more than one list or table, you must set the DataMember property to a string that specifies the list to bind to. Setting this property raises the DataSourceChanged event.

The DataSource property is the default property for the BindingSource class.

Examples

The following code example assigns a list of customers to the DataSource of a BindingSource component. This code example is part of a larger example provided at How to: Raise Change Notifications Using the BindingSource ResetItem Method.

Visual Basic

Private Sub Form1_Load(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Me.Load
    ' Create and populate the list of DemoCustomer objects
    ' which will supply data to the DataGridView.
    Dim customerList As List(Of DemoCustomer) = _
    New List(Of DemoCustomer)
    customerList.Add(DemoCustomer.CreateNewCustomer())
    customerList.Add(DemoCustomer.CreateNewCustomer())
    customerList.Add(DemoCustomer.CreateNewCustomer())

    ' Bind the list to the BindingSource.
    Me.customersBindingSource.DataSource = customerList

    ' Attach the BindingSource to the DataGridView.
    Me.customersDataGridView.DataSource = Me.customersBindingSource
End Sub

private void Form1_Load(System.Object sender, System.EventArgs e)
{
    // Create and populate the list of DemoCustomer objects
    // which will supply data to the DataGridView.
    List<DemoCustomer> customerList = new List<DemoCustomer>();
    customerList.Add(DemoCustomer.CreateNewCustomer());
    customerList.Add(DemoCustomer.CreateNewCustomer());
    customerList.Add(DemoCustomer.CreateNewCustomer());

    // Bind the list to the BindingSource.
    this.customersBindingSource.DataSource = customerList;


    // Attach the BindingSource to the DataGridView.
    this.customersDataGridView.DataSource = 
        this.customersBindingSource;
}

Visual C++

void Form1_Load( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   // Create and populate the list of DemoCustomer objects
   // which will supply data to the DataGridView.
   List< DemoCustomer^ >^ customerList = gcnew List< DemoCustomer^ >;
   customerList->Add( DemoCustomer::CreateNewCustomer() );
   customerList->Add( DemoCustomer::CreateNewCustomer() );
   customerList->Add( DemoCustomer::CreateNewCustomer() );

   // Bind the list to the BindingSource.
   this->customersBindingSource->DataSource = customerList;

   // Attach the BindingSource to the DataGridView.
   this->customersDataGridView->DataSource =
      this->customersBindingSource;
}

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0

Reference

BindingSource Class

BindingSource Members

System.Windows.Forms Namespace

DataMember

IList

IListSource