TextBox.OnPreRender Method
.NET Framework 3.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Registers client script for generating postback events prior to rendering on the client, if AutoPostBack is true.
Namespace: System.Web.UI.WebControlsAssembly: System.Web (in system.web.dll)
The following code example demonstrates how to override the OnPreRender method so that it always displays a one-point border in a custom TextBox server control.
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 (Visual Studio). |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Custom TextBox - OnPreRender - VJ# Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom TextBox - OnPreRender - VJ# Example</h3>
<aspSample:CustomTextBoxOnPreRender
id="TextBox1"
runat="server"
text="Hello World!">
</aspSample:CustomTextBoxOnPreRender>
</form>
</body>
</html>
package Samples.AspNet.JSL.Controls;
public class CustomTextBoxOnPreRender
extends System.Web.UI.WebControls.TextBox
{
protected void OnPreRender(System.EventArgs e)
{
// Run the OnPreRender method on the base class.
super.OnPreRender(e);
// Display the TextBox with a 1 point border.
this.set_BorderWidth(System.Web.UI.WebControls.Unit.Point(1));
} //OnPreRender
} //CustomTextBoxOnPreRender
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