Page.SetFocus Method (Control)
Sets the browser focus to the specified control.
Namespace: System.Web.UI
Assembly: System.Web (in System.Web.dll)
Parameters
- control
- Type: System.Web.UI.Control
The control to receive focus.
| Exception | Condition |
|---|---|
| ArgumentNullException | control is null. |
| InvalidOperationException | SetFocus is called when the control is not part of a Web Forms page. - or - |
Use the SetFocus method to make the specified control the active control on the Web page displayed by the browser. The SetFocus method must be called before the page is prepared for rendering to the client in the PreRender event.
 Note |
|---|
The SetFocus method will work only on browsers supporting ECMAScript version 1.3 or later. |
| Topic | Location |
|---|---|
| How to: Set Focus on ASP.NET Web Server Controls | Building ASP .NET Web Applications |
| How to: Set Focus on ASP.NET Web Server Controls | Building ASP .NET Web Applications |
The following code example sets the focus to the second text box on a Web page.
| Security Note |
|---|
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview. |
<%@ page language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> void Page_Init(object sender, EventArgs e) { SetFocus(focusHere); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <asp:textbox id="default" runat="server" /><br /> <asp:textbox id="focusHere" runat="server" /> </form> </body> </html>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
