RadioButton Class (System.Web.UI.WebControls)

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

RadioButton Class

Represents a radio button control.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class RadioButton _
    Inherits CheckBox _
    Implements IPostBackDataHandler

Visual Basic (Usage)

Dim instance As RadioButton

[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class RadioButton : CheckBox, 
    IPostBackDataHandler

Visual C++

[AspNetHostingPermissionAttribute(SecurityAction::InheritanceDemand, Level = AspNetHostingPermissionLevel::Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction::LinkDemand, Level = AspNetHostingPermissionLevel::Minimal)]
public ref class RadioButton : public CheckBox, 
    IPostBackDataHandler

JScript

public class RadioButton extends CheckBox implements IPostBackDataHandler

ASP.NET

<asp:RadioButton />

Remarks

The RadioButton server control permits you to intersperse the radio buttons in a group with other content in the page. The buttons are grouped logically if they all share the same GroupName property.

Note:
You can use the RadioButton control to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. ASP.NET provides an input request validation feature to block script and HTML in user input. Validation server controls are also provided to assess user input. For more information, see Validation Server Control Syntax.

Note:

You can use the RadioButton control to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. ASP.NET provides an input request validation feature to block script and HTML in user input. Validation server controls are also provided to assess user input. For more information, see Validation Server Control Syntax.

Accessibility

The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.

Topic	Location
How to: Add Individual RadioButton Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add Individual RadioButton Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add RadioButton Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add RadioButton Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add RadioButton Web Server Controls to a Web Forms Page (Visual Studio)	Building ASP .NET Web Applications in Visual Studio
How to: Add RadioButtonList Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add RadioButtonList Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications
How to: Add RadioButtonList Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add RadioButtonList Web Server Controls to a Web Forms Page	Building ASP .NET Web Applications in Visual Studio
How to: Add RadioButtonList Web Server Controls to a Web Forms Page (Visual Studio)	Building ASP .NET Web Applications in Visual Studio
How to: Respond to a User Selection in a RadioButton Web Server Control Group	Building ASP .NET Web Applications
How to: Respond to a User Selection in a RadioButton Web Server Control Group	Building ASP .NET Web Applications
How to: Respond to a User Selection in a RadioButton Web Server Control Group	Building ASP .NET Web Applications in Visual Studio
How to: Respond to a User Selection in a RadioButton Web Server Control Group	Building ASP .NET Web Applications in Visual Studio
How to: Set and Get the Selection in a RadioButton Web Server Control	Building ASP .NET Web Applications
How to: Set and Get the Selection in a RadioButton Web Server Control	Building ASP .NET Web Applications
How to: Set and Get the Selection in a RadioButton Web Server Control	Building ASP .NET Web Applications in Visual Studio
How to: Set and Get the Selection in a RadioButton Web Server Control	Building ASP .NET Web Applications in Visual Studio
How to: Set Focus on ASP.NET Web Server Controls	Building ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server Controls	Building ASP .NET Web Applications
How to: Set Focus on ASP.NET Web Server Controls	Building ASP .NET Web Applications in Visual Studio
How to: Set Focus on ASP.NET Web Server Controls	Building ASP .NET Web Applications in Visual Studio
How to: Set Layout in a RadioButtonList Web Server Control	Building ASP .NET Web Applications
How to: Set Layout in a RadioButtonList Web Server Control	Building ASP .NET Web Applications
How to: Set Layout in a RadioButtonList Web Server Control	Building ASP .NET Web Applications in Visual Studio
How to: Set Layout in a RadioButtonList Web Server Control	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building Applications with Visual Web Developer
Walkthrough: Creating and Using ASP.NET Master Pages in Visual Web Developer	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Data Binding to a Custom Business Object	Building ASP .NET Web Applications in Visual Studio
Walkthrough: Working with Cascading Style Sheet Styles in Visual Web Developer	Building ASP .NET Web Applications in Visual Studio

Examples

The following code example illustrates how to use the RadioButton control.

Visual Basic

<%@ 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  >
 <head>
    <title>RadioButton Example</title>
<script language="VB" runat="server">

    Sub SubmitBtn_Click(Sender As Object, e As EventArgs)

        If Radio1.Checked Then
            Label1.Text = "You selected " & Radio1.Text
        ElseIf Radio2.Checked Then
            Label1.Text = "You selected " & Radio2.Text
        ElseIf Radio3.Checked Then
            Label1.Text = "You selected " & Radio3.Text
        End If
    End Sub

     </script>

 </head>
 <body>

     <h3>RadioButton Example</h3>

     <form id="form1" runat="server">

         <h4>Select the type of installation you want to perform:</h4>

         <asp:RadioButton id="Radio1" Text="Typical" Checked="True" GroupName="RadioGroup1" runat="server" /><br />

         This option installs the features most typically used.  <i>Requires 1.2 MB disk space.</i><br />

         <asp:RadioButton id="Radio2" Text="Compact" GroupName="RadioGroup1" runat="server"/><br />

         This option installs the minimum files required to run the product.  <i>Requires 350 KB disk space.</i><br />

         <asp:RadioButton id="Radio3" runat="server" Text="Full" GroupName="RadioGroup1" /><br />

         This option installs all features for the product.  <i>Requires 4.3 MB disk space.</i><br />

         <asp:button text="Submit" OnClick="SubmitBtn_Click" runat="server"/>

         <asp:Label id="Label1" font-bold="true" runat="server" />

     </form>

 </body>
 </html>

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html  >
 <head>
    <title>RadioButton Example</title>
<script language="C#" runat="server">

         void SubmitBtn_Click(Object Sender, EventArgs e) {

             if (Radio1.Checked) {
                 Label1.Text = "You selected " + Radio1.Text;
             }
             else if (Radio2.Checked) {
                 Label1.Text = "You selected " + Radio2.Text;
             }
             else if (Radio3.Checked) {
                 Label1.Text = "You selected " + Radio3.Text;
             }
         }

     </script>

 </head>
 <body>

     <h3>RadioButton Example</h3>

     <form id="form1" runat="server">

         <h4>Select the type of installation you want to perform:</h4>

         <asp:RadioButton id="Radio1" Text="Typical" Checked="True" GroupName="RadioGroup1" runat="server" /><br />

         This option installs the features most typically used.  <i>Requires 1.2 MB disk space.</i><br />

         <asp:RadioButton id="Radio2" Text="Compact" GroupName="RadioGroup1" runat="server"/><br />

         This option installs the minimum files required to run the product.  <i>Requires 350 KB disk space.</i><br />

         <asp:RadioButton id="Radio3" runat="server" Text="Full" GroupName="RadioGroup1" /><br />

         This option installs all features for the product.  <i>Requires 4.3 MB disk space.</i><br />

         <asp:button text="Submit" OnClick="SubmitBtn_Click" runat="server"/>

         <asp:Label id="Label1" font-bold="true" runat="server" />

     </form>

 </body>
 </html>

.NET Framework Security

AspNetHostingPermission
for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
AspNetHostingPermission
for operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.

Inheritance Hierarchy

System..::.Object
  System.Web.UI..::.Control
    System.Web.UI.WebControls..::.WebControl
      System.Web.UI.WebControls..::.CheckBox
        System.Web.UI.WebControls..::.RadioButton

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

RadioButton Members

System.Web.UI.WebControls Namespace

CheckBox

Other Resources

RadioButton and RadioButtonList Web Server Controls Overview