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TextBox.OnPreRender Method

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.WebControls
Assembly: System.Web (in system.web.dll)

protected internal override void OnPreRender (
	EventArgs e
)
protected void OnPreRender (
	EventArgs e
)
protected internal override function OnPreRender (
	e : EventArgs
)

Parameters

e

An EventArgs that contains the event data.

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.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<HTML>
	<HEAD>
		<title>Custom TextBox - OnPreRender - C# Example</title>
	</HEAD>
	<body>
		<form id="Form1" method="post" runat="server">
			<h3>Custom TextBox - OnPreRender - C# Example</h3>
			
			<aspSample:CustomTextBoxOnPreRender 
			  id="TextBox1" 
			  runat="server">Hello World!
			</aspSample:CustomTextBoxOnPreRender>
			
		</form>
	</body>
</HTML>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
    <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>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomTextBoxOnPreRender : System.Web.UI.WebControls.TextBox
  {
    protected override void OnPreRender(System.EventArgs e)
    {
      // Run the OnPreRender method on the base class.
      base.OnPreRender(e);

      // Display the TextBox with a 1 point border.
      this.BorderWidth = System.Web.UI.WebControls.Unit.Point(1);
    }
  }
}

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

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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