How do I specify dispatcher correctly?

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C#

WPF

Dispatcher

I have created a DispatcherHelper as follows:

//*************************************************************************************/
// Dispatcher Heler
//*************************************************************************************/
public static class DispatcherHelper
{
	public static void Execute(Action action)
	{
		if (Application.Current is null||Application.Current.Dispatcher is null)
			return;

		// Marshall to Main Thread
		Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background,action);
	}
}

I have an observable collection and want to show changes on the UI each time a change occurs. The revant code I have is as follows:

// Save New File Name to Observable and Display it.
rOB.NewName=newFileName;
rOB.SecondPass=false;
rOB.RenameStatus="No WEB Details yet";
rOB.DontRename=false;
//
//Utils.DispatcherHelper.Execute(() => ;
return newFileName;

How do I specify the line commencing with Utils.DispatcherHelper correctly?

What I have tried:

I have another area of code that just displays my original files and it works fine.

// Display and Load Rename Observable Collection with Original File Name
//Utils.DispatcherHelper.Execute(() => Gbl.rO.Add(new RenameObservable(fileName,"","Orig Loaded",true,true,filePath,file)));

I have tried many ways but cannot get it to work.