CheckBox Control

Definition and Usage

The CheckBox control is used to display a check box.

Properties

Property	Description
AutoPostBack	A Boolean value that specifies whether the form should be posted immediately after the Checked property has changed or not. Default is false
Checked	A Boolean value that specifies whether the check box is checked or not
id	A unique id for the control
OnCheckedChanged	The name of the function to be executed when the Checked property has changed
runat	Specifies that the control is a server control. Must be set to "server"
Text	The text next to the check box
TextAlign	On which side of the check box the text should appear (right or left)

Example 1

In the following example we declare two TextBox controls and one CheckBox control in an .aspx file. Then we create an event handler for the CheckedChanged event to copy the contents of a text box containing the home phone of a customer into a text box that contains the work phone:

<script runat="server">
  Sub Check_Clicked(sender As Object, e As EventArgs) 
    if Check1.Checked then
      work.Text=home.Text
    else
      work.Text=""
    end if
  End Sub
</script>

<html>
<body>
<form runat="server">
<table>
<tr>
<td>Home Phone:</td>
<td><asp:TextBox id="home" runat="server"/></td>
</tr>
<tr>
<td>Work Phone:</td>
<td><asp:TextBox id="work" runat="server"/></td>
</tr>
<tr>
<td></td>
<td>
<asp:CheckBox id="Check1" AutoPostBack="True"
Text="Same as home phone" TextAlign="Right"
OnCheckedChanged="Check_Clicked" runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>

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