public static bool GetHasActivationExtension( 
   Table table,
   Guid extensionId
)

{
  // Must be called within QueuedTask.Run
  void ExtensionIds1(Table table)
  {
    // Add an extension id to a table
    // Check documentation for restrictions on backward compatibility - backward
    // compatibility is limited to ArcGIS Pro 3.1 if an extension id is added.
    // Note: This is an extension method. It is for use in addins only and not CoreHost.
    string extension_id_string = "52d8f3be-b73d-4140-beaf-23d4f9b697ea";
    Guid extension_id = Guid.Parse(extension_id_string);

    // Note: Must be within the lambda of   QueuedTask.Run()
    // Register the extension id with the relevant table
    table.AddActivationExtension(extension_id);

    // Remove an extension id from a table
    // Restores backward compatibility assuming no other compatibility limitations are in place.
    // Note: This is an extension method. It is for use in addins only and not CoreHost.
    table.RemoveActivationExtension(extension_id);

    // Check if a given extension id  is registered with a particular table.
    // Note: This is an extension method. It is for use in addins only and not CoreHost.
    if (table.GetHasActivationExtension(extension_id))
    {
      //Implement custom logic relevant to presence of extension_id ...
    }

    // Enumerate all extension ids on a given table.
    // Note: This is an extension method. It is for use in addins only and not CoreHost.
    foreach (Guid ext_id in table.GetActivationExtensions())
    {
      // Logic based on extension ids ...
    }
  }
}