Example of adding scripting code to an ASPX page by customizing the class

Script | page Set the initialfocus for a asp.net webform
The Pageutil class has a static method Setinitialfocus (control) which can is used to generate a JavaScript for a asp.net Page (WebForm), which sets the focus in a (given) control.

private void Page_Load (object sender, System.EventArgs e)
{
Set the Initialfocus on TextBox1
Pageutil.setinitialfocus (TextBox1);




Using System;
Using System.Web.UI;

Namespace Initialfocusdemo
{
<summary>
Utility class for a asp.net page
</summary>
public class Pageutil
{

<summary>
Set the Intialfocus to the given control. Only works as JavaScript is supported.
</summary>
<param name= ' control ' >control to set the Initialfocus on.</param>
public static void Setinitialfocus (Control control) {
if (control. Page = = null) {
throw new ArgumentException ("The control must is added to a Page before your can set the Intialfocus to it.");
}
if (control. Page.Request.Browser.JavaScript = = True) {
Control. Page.registerclientscriptblock ("Initialfocus",
"<script for= ' window ' event= ' onload ' language= ' JScript ' >document.all."
+ Control. UniqueID + ". Focus ();</script>");
}
}

}
}