IsEnabled can be used to determine if AJAX has been enabled already as we only need one Script Manager per page.

Namespace: DotNetNuke.Framework
Assembly: DotNetNuke (in DotNetNuke.dll)

Syntax

C#
public static bool IsEnabled()
Visual Basic
Public Shared Function IsEnabled As Boolean

Return Value

returnsM:DotNetNuke.Framework.AJAX.IsEnabled

Remarks