Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

BindingSource.AddingNew Event

Occurs before an item is added to the underlying list.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public event AddingNewEventHandler AddingNew
/** @event */
public void add_AddingNew (AddingNewEventHandler value)

/** @event */
public void remove_AddingNew (AddingNewEventHandler value)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

Exception typeCondition

InvalidOperationException

NewObject is not the same type as the type contained in the list.

The AddingNew event occurs before a new object is added to the underlying list represented by the List property. This event is fired after the AddNew method is called, but before the new item is created and added to the underlying list. By handling this event, the programmer can provide custom item creation and insertion behavior without being forced to derive from the BindingSource class. This is accomplished in the event handler by setting the NewObject property of the System.ComponentModel.AddingNewEventArgs parameter to the new item. The new object created in the AddingNew event must be of the same type as the type contained in the list or an exception will occur. You cannot set the NewObject property when bound to a DataView or DataTable because you cannot add a new DataRowView to the list.

For more information about supplying custom new item functionality, see the AddNew method. For more information about handling events, see Consuming Events.

The following code example uses a BindingSource component to bind a list to a DataGridView control. New items are added to the list by the AddingNew event handler. This code example is part of a larger example provided in How to: Customize Item Addition with the Windows Forms BindingSource.

// This event handler provides custom item-creation behavior.
void customersBindingSource_AddingNew(
    object sender, 
    AddingNewEventArgs e)
{
    e.NewObject = DemoCustomer.CreateNewCustomer();
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

.NET Compact Framework

Supported in: 2.0

Community Additions

ADD
Show:
© 2015 Microsoft