The image will change to a file when it is added to the folder

I have a little problem. I would like to add an image from a folder to a project so that I don't have a mess in the project. The images that I have directly in the project not in the folder . Do you know what to do? I want to change the images after clicking the button, that's why I want more images there

My code where I want change Images, it works with Images inside project

 public void ChangeImg(Uri resourceUri,Image image)
        {
            StreamResourceInfo streamInfo =
          Application.GetResourceStream(resourceUri);
            BitmapFrame temp = BitmapFrame.Create(streamInfo.Stream);
            var brush = new ImageBrush();
            brush.ImageSource = temp;
            image.Source = brush.ImageSource;
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
           
            ChangeImg(new Uri("images/timetable_Unselected.png",
            UriKind.Relative), img_Home_Unselected);
        }