Screen current resolution without @60 hz

i want to put the current resolution in a dropdown. it works except that it writes “1920x1080 @60 hz”, but i want to just be “1920x1080”. how can i solve it?

    public Dropdown Resolutions;

	void Start ()
	{
		List<string> ResolutionValues = new List<string>();
		ResolutionValues.Add(Screen.currentResolution.ToString());
		Resolutions.ClearOptions();
		Resolutions.AddOptions(ResolutionValues);
	}

solved!
i just changed the

ResolutionValues.Add(Screen.currentResolution.ToString());

to

 ResolutionValues.Add(Screen.currentResolution.width + " x " + Screen.currentResolution.height);