New to Telerik UI for ASP.NET AJAX? Download free 30-day trial

Render Modes

This article demonstrates the usage and the advantages, brought you by the RenderModes of the RadListBox.


The RadListBox RenderMode property accepts three values:

  • Classic - this render mode preserves the original rendering of the control - li elements with nested span elements are used to create layout.

  • Lightweight - this is the default RenderMode which yields different markup making maximum use of CSS 3 and semantic html. This means that we no longer use span element for the items and have dropped the image gradients in favor of CSS gradients. As for the skins, the main goal of using the Lightweight render mode is that image gradients could be easily replaced by CSS gradients. Thus, the amount of data that the client browser should request is sensibly decreased. This enhancement favors especially the mobile experience.

  • Auto - this mode makes each control choose the appropriate rendering mode according to the used browser - Classic or Lightweight.

The "RenderingMode" property of the RadListBox is now obsoleted.

Setting Render Mode

There are two ways to set the RenderMode for the RadListBox:

  • When the RenderMode property is set in the markup you can type in a string, when set in the code-behind it takes a member of the Telerik.Web.UI.RenderMode enum. For example:
<telerik:RadListBox RenderMode="Lightweight" runat="server" ID="RadListBox1"></telerik:RadListBox>
  • A global setting in the web.config file that will affect the entire application, unless a concrete value is specified for RadListBox instance:

    • Change render mode for all RadListBoxes in your application
    • Change render mode for all controls in your application

Change render mode for all RadListBox:

    <add key="Telerik.Web.UI.RadListBox.RenderMode" value="lightweight" />

Change render mode for all controls:

    <add key="Telerik.Web.UI.RenderMode" value="lightweight" />

See Also

In this article
Not finding the help you need? Improve this article