TextBox.OnPreRender Method (EventArgs)
.NET Framework (current version)
This API supports the product 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.
Assembly: 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
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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. |
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %> <%@ Page Language="VB" 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 - VB.NET Example</title> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom TextBox - OnPreRender - VB.NET Example</h3> <aspSample:CustomTextBoxOnPreRender id="TextBox1" runat="server">Hello World!</aspSample:CustomTextBoxOnPreRender> </form> </body> </html>
Imports System.Web Imports System.Security.Permissions Namespace Samples.AspNet.VB.Controls <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomTextBoxOnPreRender Inherits System.Web.UI.WebControls.TextBox Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs) ' Run the OnPreRender method on the base class. MyBase.OnPreRender(e) ' Display the TextBox with a 1 point border. Me.BorderWidth = System.Web.UI.WebControls.Unit.Point(1) End Sub End Class End Namespace
.NET Framework
Available since 1.1
Available since 1.1
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