This is for Color to Brush....
Color
Brush
you can't convert it, you have to make a new brush....
SolidColorBrush brush = new SolidColorBrush( myColor );
now, if you need it in XAML, you COULD make a custom value converter and use that in a binding
Brush brush = new SolidColorBrush(color);
The other way around:
if (brush is SolidColorBrush colorBrush) Color color = colorBrush.Color;
Or something like that.
Point being not all brushes are colors but you could turn all colors into a (SolidColor)Brush.
SolidColorBrush brush = new SolidColorBrush( Color.FromArgb(255,255,139,0) )