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You are currently looking at documentation for Umbraco 8 and older versions.
Go to docs.umbraco.com/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/radiobutton-list for documentation for Umbraco 9 and newer versions.

    Radiobutton List

    Alias: Umbraco.RadioButtonList

    Returns: string

    Pretty much like the name indicates this Data type enables editors to choose from list of radio buttons and returns the value of the selected item as string.

    Data Type Definition Example

    Radiobutton List Data Type Definition

    Content Example

    Radiobutton List Content

    MVC View Example

    Typed

    Without Modelsbuilder

    @if (Model.HasValue("colorTheme"))
{
    var value = Model.Value("colorTheme");
    <p>@value</p>
}

    With Modelsbuilder

    @if (Model.ColorTheme != null)
{
    var value = Model.ColorTheme;
    <p>@value</p>
}

    Add values programmatically

    See the example below to see how a value can be added or changed programmatically. To update a value of a property editor you need the Content Service.

    @{
    // Get access to ContentService
    var contentService = Services.ContentService;

    // Create a variable for the GUID of the page you want to update
    var guid = new Guid("796a8d5c-b7bb-46d9-bc57-ab834d0d1248");
    
    // Get the page using the GUID you've defined
    var content = contentService.GetById(guid); // ID of your page
    
    // Set the value of the property with alias 'colorTheme'
    content.SetValue("colorTheme", "water");
            
    // Save the change
    contentService.Save(content);
}

    Although the use of a GUID is preferable, you can also use the numeric ID to get the page:

    @{
    // Get the page using it's id
    var content = contentService.GetById(1234); 
}

    If Modelsbuilder is enabled you can get the alias of the desired property without using a magic string:

    @{
    // Set the value of the property with alias 'colorTheme'
    content.SetValue(Home.GetModelPropertyType(x => x.ColorTheme).Alias, "water");
}