Sets input focus to a control.
Assembly: System.Web (in System.Web.dll)
Use the Focus method to set the initial focus of the Web page to the control. The page will be opened in the browser with the control selected.
The Focus method causes a call to the page focus script to be emitted on the rendered page. If the page does not contain a control with an HTML ID attribute that matches the control that the Focus method was invoked on, then page focus will not be set. An example where this can occur is when you set the focus on a user control instead of setting the focus on a child control of the user control. In this scenario, you can use the FindControl method to find the child control of the user control and invoke its Focus method.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.