CheckBoxList.Render Method (HtmlTextWriter)
.NET Framework (current version)
Displays the CheckBoxList on the client.
Assembly: System.Web (in System.Web.dll)
Parameters
- writer
-
Type:
System.Web.UI.HtmlTextWriter
A System.Web.UI.HtmlTextWriter that contains the output stream for rendering on the client.
The Render method is used primarily by control developers in custom controls that derive from the CheckBoxList class.
The Render implementation for a CheckBoxList control initializes a RepeatInfo object for the list, and calls the RenderRepeater method, which in turn uses the RenderItem method to render individual check box list items.
The following code example demonstrates how to override the Render method in a custom server control so that the CheckBoxList always displays an image.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %> <%@ Page language="VB" %> <!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 CheckBoxList - Render - VB.NET Example</title> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom CheckBoxList - Render - VB.NET Example</h3> <aspSample:CustomCheckBoxListRender id="CheckBoxList" runat="server" RepeatLayout="Table" RepeatColumns="2" CellSpacing="3" CellPadding="3"> <asp:ListItem Selected="True">Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> <asp:ListItem>Item 4</asp:ListItem> <asp:ListItem>Item 5</asp:ListItem> <asp:ListItem>Item 6</asp:ListItem> </aspSample:CustomCheckBoxListRender> </form> </body> </html>
Imports System.Web Imports System.Security.Permissions Namespace Samples.AspNet.VB.Controls <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomCheckBoxListRender Inherits System.Web.UI.WebControls.CheckBoxList Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter) ' Create and render a new Image Web control. Dim image As New System.Web.UI.WebControls.Image image.ID = "Image1" image.ImageUrl = "image.jpg" image.AlternateText = "Image for CheckBoxList1." image.RenderControl(writer) ' Call the base class's Render method. MyBase.Render(writer) End Sub End Class End Namespace
.NET Framework
Available since 1.1
Available since 1.1
Show: