Gets or sets the tab index of the Web server control.
Assembly: System.Web (in System.Web.dll)
The specified tab index is not between -32768 and 32767.
Use the property to specify or determine the tab index of a Web server control on the Web Forms page. When you press the Tab key, the order in which the Web server controls receive focus is determined by the property of each control. When a page is initially loaded, the first item that receives focus when the Tab key is pressed is the address bar. Next, the controls on the Web Forms page are tabbed to in ascending order, based on the value of the property of each control, starting with the smallest positive, nonzero value. If multiple controls share the same tab index, the controls will receive focus in the order they are declared on the Web Forms page. Finally, controls that have a tab index of zero are tabbed to in the order they are declared.
Only controls with a nonzero tab index will render the tabindex attribute.
You can remove a Web Server control from the tab order by setting the property to a negative value.
This property is supported only in Internet Explorer 4 and later.
The following example illustrates how to use the property of the WebControl to set the tab order of controls on the page.
The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.
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.
Windows 8.1, Windows Server 2012 R2, 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.