RadAjax for ASP.NET AJAX
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RadControls for ASP.NET AJAX

No matter which control you would chose, the updated via ajax controls would render in a HTML DIV tag which displays by default as a block element. In order to change this behavior RadAjax exposes the following properties:

UpdatePanelsRenderMode - this property can be set to the RadAjaxManager itself to control the render mode for all ajaxified controls. You can have values Block (the default value) and Inline.

CopyASPX
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" UpdatePanelsRenderMode="Inline">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="Button1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label1" />
                <telerik:AjaxUpdatedControl ControlID="Label2" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>

UpdatePanelRenderMode - this property is to be used for a particular AjaxUpdatedControl setting in the RadAjaxManager. Its default value is Block as well and can be changed to Inline.

CopyASPX
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="Button1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label1" UpdatePanelRenderMode="Inline" />
                <telerik:AjaxUpdatedControl ControlID="Label2" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>

RenderMode - to changed the render mode of controls wrapped in RadAjaxPanel control, set its RenderMode property to Inline or Block (the default value).

CopyASPX
<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" RenderMode="Inline">
    <asp:Button ID="Button1" runat="server" Text="AJAX" />
    <asp:Label ID="Label1" runat="server" Text="Label1" />
</telerik:RadAjaxPanel>
Caution

If one updated control has several initiators and is present in several places in the AjaxSettings, then setting UpdatePanelRenderMode="Inline" at one place will guarantee that the final render mode of the generated update panel is "Inline". The only way to override this is at runtime in AjaxSettingCreated:

Caution

Note that the following scenario is currently unsupported (including the properties for both the RadAjaxManager and per AjaxUpdatedControl):

CopyASPX
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" UpdatePanelsRenderMode="Inline">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="Button1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label1" UpdatePanelRenderMode="Block" />
                <telerik:AjaxUpdatedControl ControlID="Label2" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>