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HtmlInputRadioButton Class

Allows programmatic access to the HTML <input type= radio> element on the server.

Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)

public class HtmlInputRadioButton : HtmlInputControl, IPostBackDataHandler
public class HtmlInputRadioButton extends HtmlInputControl implements IPostBackDataHandler
public class HtmlInputRadioButton extends HtmlInputControl implements IPostBackDataHandler

Use the HtmlInputRadioButton control to create a radio button on a Web page. The HtmlInputRadioButton control does not provide built-in functionality to display a caption for the radio button. To create a caption, use literal text in the Web page at the desired location. This allows you to determine where the caption is displayed relative to the radio button. For example, if you want to display the caption on the right side of the radio button, declare an HtmlInputRadioButton control, followed by the caption text, as shown in the following code.

 <input type="radio" 
  id="Radio1" 
  name="Mode" 
  runat="server"/>
 Caption Text<br>

You can optionally associate a quantity with the HtmlInputRadioButton control by setting the Value property. This is useful when you have multiple radio buttons and need to perform a calculation, based on the selection.

HtmlInputRadioButton controls can be grouped together by specifying a common value for the Name property of each radio button you want to include in the group.

NoteNote

When you group HtmlInputRadioButton controls together, only one radio button in the group can be selected at a time.

To determine whether the HtmlInputRadioButton control is selected, test the Checked property. If you have a group of HtmlInputRadioButton controls, you must iterate through the controls and test the Checked property of each control individually.

The HtmlInputRadioButton control provides a ServerChange event that is raised when the Checked property changes values between posts to the server. This allows you to create a custom event handler that performs a specific set of instructions when the event is raised, such as data validation.

For a list of initial property values for an instance of HtmlInputRadioButton, see the HtmlInputRadioButton constructor.

The following code example demonstrates how to use the HtmlInputRadioButton control to create a group of radio buttons.

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>

   <script language="C#" runat="server">

      void Button1_Click(object sender, EventArgs e) 
      {

         if (Radio1.Checked == true)
            Span1.InnerHtml = "Option 1 is selected";
         else if (Radio2.Checked == true)
            Span1.InnerHtml = "Option 2 is selected";
         else if (Radio3.Checked == true)
            Span1.InnerHtml = "Option 3 is selected";
      }

   </script>

</head>
<body>

   <form runat=server>

      <h3>HtmlInputRadioButton Sample</h3>

      <input type="radio" 
             id="Radio1" 
             name="Mode" 
             runat="server"/>

      Option 1<br>

      <input type="radio" 
             id="Radio2" 
             name="Mode" 
             runat="server"/>
      
      Option 2<br>

      <input type="radio" 
             id="Radio3" 
             name="Mode" 
             runat="server"/>

      Option 3

      <p>
      <span id="Span1" runat="server" />

      <p>
      <input type="button" 
             id="Button1" 
             value="Enter" 
             OnServerClick="Button1_Click" 
             runat="server">

   </form>

</body>
</html>
   

System.Object
   System.Web.UI.Control
     System.Web.UI.HtmlControls.HtmlControl
       System.Web.UI.HtmlControls.HtmlInputControl
        System.Web.UI.HtmlControls.HtmlInputRadioButton

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

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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