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CheckBox Constructor

Initializes a new instance of the CheckBox class.

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

public CheckBox()

Use this constructor to create and initialize a new instance of the CheckBox class.

NoteNote

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.


<%@ 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 xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">
    <title> CheckBox Constructor Example </title>
<script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {

         // Create new CheckBox control.
         CheckBox NewCheckBox = new CheckBox();
         NewCheckBox.ID="FeatureCheckBox";
         NewCheckBox.Text="Enable feature";
         NewCheckBox.AutoPostBack = true;

         // Register the event-handling method for the CheckedChanged event. 
         NewCheckBox.CheckedChanged += new EventHandler(this.Check_Change);

         // Add the control to the Controls collection of the
         // PlaceHolder control. 
         Place.Controls.Clear();
         Place.Controls.Add(NewCheckBox);

      }

      void Check_Change(Object sender, EventArgs e)
      {

         // Retrieve the CheckBox control from the PlaceHolder control.
         CheckBox check = (CheckBox)Place.FindControl("FeatureCheckBox");

         // Display the appropriate message based on the state of the
         // CheckBox control. 
         if(check.Checked)
         {
            Message.Text = "Feature enabled.";
         }
         else
         {
            Message.Text = "Feature disabled.";
         }

      }

   </script>

</head>

<body>

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

      <h3> CheckBox Constructor Example </h3>

      Click the check box.

      <br /><br />

      <asp:Placeholder id="Place" 
           runat="server"/>

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>

</html>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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