How to solve "Cross thread operation not valid"

Private Sub StartFileWatcher()

        ' Create a new FileSystemWatcher and set its properties. 
        Dim FileWatcher As New FileSystemWatcher()
        
        FileWatcher.SynchronizingObject = Me

        FileWatcher.Path = txtImageFolder.Text
        
        ' Watch for changes in LastWrite times
        FileWatcher.NotifyFilter = (NotifyFilters.LastAccess)

        ' Add event handlers.
        AddHandler FileWatcher.Changed, AddressOf OnChanged

        ' Begin watching.
        FileWatcher.EnableRaisingEvents = True


    End Sub

public delegate R InvokeAction<R>();
public delegate R InvokeParameterizedAction<R>(params object[] data);


public static void CrossThread<T>(this T t, InvokeAction action) where T : Control
        {
            if (t.InvokeRequired)
                t.Invoke(action);
            else
                action();
        }
public static R CrossThread<T, R>(this T t, InvokeParameterizedAction<R> action, params object[] data) where T : Control
        {
            if (t.InvokeRequired)
                return (R)t.Invoke(action, data);
            else
                return action(data);
        }

TextBoxObject.CrossThread(()=>
{
// ... Do stuff here from another thread
});
// OR

TextBoxObject.CrossThread((textbox,newtext) =>
{
textbox.Text = newtext;
}, TextBoxObject,"Update Text");