i can change custom color Rectangle with something like : \"#A125AA\" in xaml.
But i don\'t know where to find code change custom color i have
i just know code f
you can set the color through RGB. This isn't done in hex like you're doing in your xaml.
Color color = new Color() { R = 255, G = 255, B = 255 };
Brush brush= new SolidColorBrush(color);
the hex values you have in your example #A125AA are also RGB R = A1, G = 25, B = AA
You could convert these values with a helper method so you can add them to your Color object.
If you want to use the names, here is also a list of a lot of RGB codes matched to their names
You can use the hexadecimal number directly in your XAML, as the following shows :-
<Grid x:Name="ContentPanel"
Grid.Row="1"
Margin="12,0,12,0"
Background="#A125AA"></Grid>