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Control.DataBind Method ()

Binds a data source to the invoked server control and all its child controls.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
public virtual void DataBind ()
public void DataBind ()
public function DataBind ()
Not applicable.

Use this method to bind data from a source to a server control. This method is commonly used after retrieving a data set through a database query. The method is primarily used by control developers; most controls perform databinding automatically.

NoteNote:

When called on a server control, this method resolves all data-binding expressions in the server control and in any of its child controls.

This method is commonly overridden when creating custom templated data-bound controls. For more information, see How to: Create Templated ASP.NET User Controls.

For more information about binding data to server controls, see Data Binding Expression Syntax.

The following example overrides the DataBind method in a custom ASP.NET server control. It begins by calling the base OnDataBinding method and then uses the ControlCollection.Clear method to delete all the child controls and the ClearChildViewState method to delete any saved view-state settings for those child controls. Finally, the ChildControlsCreated property is set to true and the control is instructed to track any changes to the view state of the newly created controls with the TrackViewState method. This is a common technique when binding data to a control to ensure that new data does not conflict with data stored from a previous DataBind method call.

public override void DataBind() 
{
   base.OnDataBinding(EventArgs.Empty);
   // Reset the control's state.
   Controls.Clear();
   // Check for HasChildViewState to avoid unnecessary calls to ClearChildViewState.
   if (HasChildViewState)
      ClearChildViewState();
   ChildControlsCreated = true;
   if (!IsTrackingViewState)
      TrackViewState();
}

public void DataBind()
{
    super.OnDataBinding(EventArgs.Empty);

    // Reset the control's state.
    get_Controls().Clear();

    // Check for HasChildViewState to avoid unnecessary calls to 
    // ClearChildViewState.
    if (get_HasChildViewState()) {
        ClearChildViewState();
    }
    set_ChildControlsCreated(true);
    if (!(get_IsTrackingViewState())) {
        TrackViewState();
    }
} //DataBind

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0
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