# <RadioButton>

The RadioButton tag renders as a radio button and associated label at run-time. Using a series of RadioButton controls, along with the GroupName property, you can create a list of mutually exclusive options. This can be a useful alternative to using a RadioButtonList. With the RadioButtonList, only one value is sent to the datasource. If you use RadioButton controls that are grouped, you get the same mutually-exclusive options, but you also have the ability to store the value of each RadioButton in its own data field.

# Syntax

<RadioButton 
    AccessKey="string" 
    BackColor="color name|#dddddd" 
    BorderColor="color name|#dddddd" 
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge| Inset|Outset" 
    BorderWidth="size" 
    Checked="True|False"
    CssClass="string" 
    DataField="string" 
    DataType="Boolean" 
    DataValueField="string" 
    Font-Bold="True|False" 
    Font-Italic="True|False" 
    Font-Names="string" 
    Font-Overline="True|False" 
    Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium| Large|X-Large|XX-Large" 
    Font-Strikeout="True|False" 
    Font-Underline="True|False" 
    ForeColor="color name|#dddddd" 
    GroupName="string"
    Height="size" 
    ID="string" 
    Nullable="True|False" 
    Style="string" 
    TabIndex="integer"
    Text="string"
    TextAlign="Left|Right" 
    ToolTip="string" 
    Visible="True|False" 
    Width="size"
/>

# Remarks

• AccessKey: In browsers that support it, this property can be set to a character on the keyboard that can be used to set focus to the control. For instance, setting the value to F allows the user to access the control by pressing Alt+F on their keyboard (for Windows machines).

• BackColor: Color of the background of the control.

• BorderColor: Color of the border around the control.

• BorderStyle: Style of the border around the control.

• BorderWidth: Width of the border around the control, specified in units

• Checked: Determines whether the radio button is checked.

• CssClass: Name of the Cascading Style Sheets (CSS) class used to style this control.

• DataField: Name of the parameter in the <SubmitCommand> which will be filled with this control's data on when the form is submitted and/or the parameter in the <SelectCommand> which will supply this control's data when the form is loaded. This attribute is required if the control will participate in operations with your form's data commands.

• DataType: The type of data this control is supplying to the data commands. This is a Database type. Valid values are: boolean only. This attribute is required if the control will participate in operations with your form's data commands.

• Font Properties: A series of attributes such as font-bold, font-size, etc. that allow you to control how the text in the control is displayed. More

• ForeColor: Sets the foreground color (typically the color of the text) of the control.

• GroupName: The name of the group the radio button belongs to. Use this to create a grouping of radio buttons that form a mutually exclusive list of options. When this property is specified, only one radio button may be selected within that group at any given time.

• Height: Height of the control, specified in units.

• ID: Name, consisting of letters and numbers, beginning with a letter, that uniquely identifies the control within the form.

• Nullable: If this is set to True, the control will return a DBNull value if the control has not been checked. If a DBNull value is passed to this control, regardless of the Nullable setting, the control will be un-checked.

• Style: Same as the HTML style attribute.It allows you to apply CSS styling to the control (e.g. color: red; border: solid 1px black;).

• TabIndex: Sets the tab index for the control.

• Text: The caption to display next to the radio button.

• TextAlign: The alignment of the text label with respect to its associated check box. Valid values are Left and Right. Default value is Right.

• ToolTip: In browsers that support it, sets the text to display when the mouse pointer hovers over the control.

• Visible: Determines if the control is visible (true) or hidden (false).

• Width: Width of the control in units.

# Example

<AddForm> 
  ... 
  <table> 
    <tr> 
       <td> 
        <Label Target="txtFirstName" Text="First Name" /> 
        <TextBox Id="txtFirstName" DataField="FirstName" DataType="string" /> 
      </td> 
    </tr> 
    <tr> 
      <td>
        <RadioButton Id="optAgree" DataField="AgreeToTerms" DataType="boolean" 
          Text="I agree to be bound by the terms of the contract"/>  
      </td> 
    </tr> 
    <tr> 
      <td colspan="2"> 
        <AddButton Text="Add"/> <CancelButton Text="Cancel"/> 
      </td> 
    </tr> 
  </table> 
</AddForm>