RadioButtonList.Render(HtmlTextWriter) RadioButtonList.Render(HtmlTextWriter) RadioButtonList.Render(HtmlTextWriter) RadioButtonList.Render(HtmlTextWriter) Method

Definition

Displays the RadioButtonList control on the client.

protected public:
 override void Render(System::Web::UI::HtmlTextWriter ^ writer);
protected internal override void Render (System.Web.UI.HtmlTextWriter writer);
override this.Render : System.Web.UI.HtmlTextWriter -> unit
Protected Friend Overrides Sub Render (writer As HtmlTextWriter)

Parameters

writer
HtmlTextWriter HtmlTextWriter HtmlTextWriter HtmlTextWriter

A HtmlTextWriter that contains the output stream for rendering on the client.

Examples

The following code example demonstrates how to override the Render method in a custom server control so that the RadioButtonList control is always displayed with descriptive text.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<!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 RadioButtonList - Render - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom RadioButtonList - Render - C# Example</h3>

      <aspSample:CustomRadioButtonListRender 
        id="Radiobuttonlist1" 
        runat="server" 
        RepeatColumns="2" 
        RepeatDirection="Horizontal">
        <asp:ListItem Value="Item1">Item1</asp:ListItem>
        <asp:ListItem Value="Item2">Item2</asp:ListItem>
        <asp:ListItem Value="Item3">Item3</asp:ListItem>
        <asp:ListItem Value="Item4">Item4</asp:ListItem>
      </aspSample:CustomRadioButtonListRender>
      
    </form>
  </body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.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 RadioButtonList - Render - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom RadioButtonList - Render - VB.NET Example</h3>

            <aspSample:CustomRadioButtonListRender
             id="Radiobuttonlist1" runat="server" 
             RepeatColumns="2" RepeatDirection="Horizontal">
                <asp:ListItem Value="Item1">Item1</asp:ListItem>
                <asp:ListItem Value="Item2">Item2</asp:ListItem>
                <asp:ListItem Value="Item3">Item3</asp:ListItem>
                <asp:ListItem Value="Item4">Item4</asp:ListItem>
            </aspSample:CustomRadioButtonListRender>
        </form>
    </body>
</html>
using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomRadioButtonListRender : System.Web.UI.WebControls.RadioButtonList
  {
    protected override void Render(System.Web.UI.HtmlTextWriter writer)
    {
      // Call the base RenderContents method.
      base.Render(writer);

      // Append some text to the Image.
      writer.Write("Experience Windows Server 2003 and Visual Studio® .NET 2003.");
    }
  }
}
Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomRadioButtonListRender
        Inherits System.Web.UI.WebControls.RadioButtonList

        Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)

            ' Call the base RenderContents method.
            MyBase.Render(writer)

            ' Append some text to the Image.
            writer.Write("Experience Windows Server 2003 and Visual Studio .NET 2003.")
        End Sub 'Render
    End Class
End Namespace

Remarks

This method is used primarily by control developers in custom controls that derive from the RadioButtonList class.

The Render method implementation for a RadioButtonList control initializes a RepeatInfo object for the list, and calls the RenderRepeater method, which in turn uses the RenderItem method to render individual radio button list items.

Applies to

See also