How do I set a image as the background using a string

See more:

C#

Hello coders, I am having some trouble trying to convert a string to a image and set it as the background and I do not know what is wrong with my code and the error (System.Windows.Markup.XamlParseException: ''Provide value on 'System.Windows.Baml2006.TypeConverterMarkupExtension' threw an exception.' Line number '11' and line position '14'.') pops up, if someone could help me it would me very much appreciated.

What I have tried:

private void Background1_clicked(object sender, RoutedEventArgs e)
        {
            string Background = "images/background.png";
            Change_background(Background);
        }

        public void Change_background(string Background)
        {
            var converter1 = new BrushConverter();
            var Background_set = (ImageBrush)converter1.ConvertFromString(Background);
            Grid1.Background = Background_set;
        }