ValidationSummary.OnPreRender Method
.NET Framework 2.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Raises the PreRender event.
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 error messages as bold in a custom ValidationSummary server control.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
<HEAD>
<title>Custom ValidationSummary - AddAttributesToRender - VJ# Example</title>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom ValidationSummary - AddAttributesToRender - VJ# Example</h3>
<TABLE id="Table1" cellPadding="4" cellspacing="0">
<TR>
<TD>
<TABLE id="Table2" cellPadding="4" cellspacing="0" bgColor="#eeeeee">
<TR>
<TD colSpan="3"><B>Credit Card Information</B> </TD>
</TR>
<TR>
<TD align="right">Card Type: </TD>
<TD>
<asp:RadioButtonList id="RadioButtonList1" runat="server" RepeatLayout="Flow">
<asp:ListItem>MasterCard</asp:ListItem>
<asp:ListItem>Visa</asp:ListItem>
</asp:RadioButtonList>
</TD>
<TD align="center" rowSpan="1">
<asp:RequiredFieldValidator
id="RequiredFieldValidator1"
runat="server"
ErrorMessage="Card Type"
Width="100%"
Display="Static"
ControlToValidate="RadioButtonList1">*
</asp:RequiredFieldValidator>
</TD>
</TR>
<TR>
<TD align="right">Card Number: </TD>
<TD><asp:TextBox id="TextBox1" runat="server"></asp:TextBox></TD>
<TD>
<asp:RequiredFieldValidator
id="RequiredFieldValidator2"
runat="server"
ErrorMessage="Card Number"
Width="100%"
Display="Static"
ControlToValidate="TextBox1">*
</asp:RequiredFieldValidator>
</TD>
</TR>
<TR>
<TD></TD>
<TD><asp:Button id="Button1" runat="server" text="Validate"></asp:Button></TD>
<TD></TD>
</TR>
</TABLE>
</TD>
</TR>
<TR>
<TD vAlign="top">
<aspSample:CustomValidationSummaryAddAttributesToRender
id="ValidationSummary1"
runat="server"
DisplayMode="BulletList"
HeaderText="You must enter a value in the following fields:" />
</TD>
</TR>
</TABLE>
</form>
</body>
</HTML>
...package Samples.AspNet.JSL.Controls;
public class CustomValidationSummaryAddAttributesToRender
extends System.Web.UI.WebControls.ValidationSummary
{
protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
// Show the error message as bold.
writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight,
"bold");
// Call the Base's AddAttributesToRender method.
super.AddAttributesToRender(writer);
} //AddAttributesToRender
} //CustomValidationSummaryAddAttributesToRender
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.
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