DataBoundControl.PerformSelect Method

Definition

Namespace:

System.Web.UI.WebControls

Assembly:

System.Web.dll

Retrieves data from the associated data source.

C#

protected override void PerformSelect();

Examples

The following code example demonstrates how to override the PerformSelect method to retrieve data from an associated data source using the GetData method and bind it to the elements of the control. This code example is part of a larger example provided for the DataBoundControl class.

C#

protected override void PerformSelect() {            

   // Call OnDataBinding here if bound to a data source using the
   // DataSource property (instead of a DataSourceID), because the
   // databinding statement is evaluated before the call to GetData.       
    if (!IsBoundUsingDataSourceID) {
        OnDataBinding(EventArgs.Empty);
    }            
    
    // The GetData method retrieves the DataSourceView object from  
    // the IDataSource associated with the data-bound control.            
    GetData().Select(CreateDataSourceSelectArguments(), 
        OnDataSourceViewSelectCallback);
    
    // The PerformDataBinding method has completed.
    RequiresDataBinding = false;
    MarkAsDataBound();
    
    // Raise the DataBound event.
    OnDataBound(EventArgs.Empty);
}

Remarks

The PerformDataBinding method is called after data is retrieved to bind data to elements of the data-bound control. Derived types override this method to retrieve data only if the default implementation is not adequate. Typically, it is sufficient to provide a DataSourceViewSelectCallback delegate that performs any custom data work, rather than implementing the PerformDataBinding method.

Applies to

See also

• DataBind()
• OnDataBinding(EventArgs)
• OnDataBound(EventArgs)