Form.Activate Event

Occurs when a form becomes active.

Namespace: System.Web.UI.MobileControls
Assembly: System.Web.Mobile (in

public event EventHandler Activate
/** @event */
public void add_Activate (EventHandler value)

/** @event */
public void remove_Activate (EventHandler value)

JScript supports the use of events, but not the declaration of new ones.

The Activate event occurs under the following circumstances:

  • When a page is first requested, the first form is activated.

  • When the ActiveForm property of the page is set programmatically.

  • When the user navigates to a form through a Link control whose target is a form.

This event's position in the event chain makes it very important for binding child controls to data sources or for setting a form property that can be inherited by all child controls.

The following code example shows how to set the OnActivate attribute in the Form element to point to a method that executes when the Activate event occurs. The Form2_Activate method prepares the second form for display. This example is part of a larger example for the Form overview.


The following code example uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code example must be copied into an empty text file that has an .aspx extension. For more information, see ASP.NET Web Page Code Model.

// When Form2 is activated
private void Form2_Activate(object sender, EventArgs e)
    Form2.BackColor = Color.DarkGray;
    Form2.ForeColor = Color.White;
    Form2.Font.Bold = BooleanOption.True;

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

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

.NET Framework

Supported in: 2.0, 1.1

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