ObjectDataSourceObjectEventHandler Delegate
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ObjectDataSourceObjectEventHandler Delegate


Represents the method that will handle the ObjectCreating and ObjectCreated events of the ObjectDataSource control.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public delegate void ObjectDataSourceObjectEventHandler(
	object sender,
	ObjectDataSourceEventArgs e


Type: System.Object

The source of the event.

Type: System.Web.UI.WebControls.ObjectDataSourceEventArgs

An ObjectDataSourceEventArgs that contains the event data.

When you create an ObjectDataSourceObjectEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see NIB: Consuming Events.

The following code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to retrieve and display information. In this example, as in many real-world scenarios, it might not be possible or appropriate to use a default instance of the business object with the ObjectDataSource control. In this example, the ObjectDataSource cannot successfully call the default constructor because it will throw an exception. In some cases, the default constructor might be protected, and in others it might not initialize the business object to a desired state. Whatever the reason, you can instantiate the business object yourself and set the instance to the ObjectInstance property of the ObjectDataSourceEventArgs object that is passed to the handler. This is the business object instance that the ObjectDataSource will use to perform its work.

The following code example demonstrates the example basic business object used in the preceding example.

namespace Samples.AspNet.CS {

using System;
using System.Collections;
using System.Web.UI;
using System.Web.UI.WebControls;

  public class EmployeeLogic {

    public EmployeeLogic() {  
        throw new NotSupportedException("Initialize data.");

    public EmployeeLogic(string data) {
        _data = data;

    private string _data;

    // Returns a collection of NorthwindEmployee objects.
    public ICollection GetAllEmployees () {
      ArrayList al = new ArrayList();      
      return al;



.NET Framework
Available since 2.0
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