SetFocus Method (Control)
.NET Framework Class Library
Page..::.SetFocus Method (Control)

Sets the browser focus to the specified control.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Visual Basic (Declaration)
Public Sub SetFocus ( _
    control As Control _
)
Visual Basic (Usage)
Dim instance As Page
Dim control As Control

instance.SetFocus(control)
C#
public void SetFocus(
    Control control
)
Visual C++
public:
void SetFocus(
    Control^ control
)
JScript
public function SetFocus(
    control : Control
)

Parameters

control
Type: System.Web.UI..::.Control
The control to receive focus.
ExceptionCondition
ArgumentNullException

control is nullNothingnullptra null reference (Nothing in Visual Basic).

InvalidOperationException

SetFocus is called when the control is not part of a Web Forms page.

- or -

SetFocus is called after the PreRender event.

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.

NoteNote:

The SetFocus method will work only on browsers supporting ECMAScript version 1.3 or later.

TopicLocation
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications in Visual Studio
How to: Set Focus on ASP.NET Web Server ControlsBuilding ASP .NET Web Applications in Visual Studio

The following code example sets the focus to the second text box on a Web page.

Security noteSecurity 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.

Visual Basic
<%@ page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
        SetFocus(focusHere)
    End Sub
</script>

<html  >
<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>
C#
<%@ 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  >
<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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

MaintainScrollPositionOnPostback()()()
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