To paint an area with a solid color, you can use a predefined system brush, such as Red or Blue, or you can create a new SolidColorBrush and describe its Color using alpha, red, green, and blue values. In XAML, you may also paint an area with a solid color by using hexidecimal notation.
The following examples uses each of these techniques to paint a Rectangle blue.
Using a Predefined Brush:
<Rectangle Width="50" Height="50" Fill="Blue" />
// Create a rectangle and paint it with // a predefined brush.
Rectangle myPredefinedBrushRectangle = new Rectangle();
myPredefinedBrushRectangle.Width = 50;
myPredefinedBrushRectangle.Height = 50;
myPredefinedBrushRectangle.Fill = Brushes.Blue;
Using Hexadecimal Notation:
Note that the first two characters "FF" of the 8-digit
value is the alpha which controls the transparency of
the color. Therefore, to make a completely transparent
color (invisible), use "00" for those digits (e.g. #000000FF).
<Rectangle Width="50" Height="50" Fill="#FF0000FF" />
Using ARGB Values:
The next example creates a SolidColorBrush and describes its Color using the ARGB values for the color blue.
<Rectangle Width="50" Height="50">
<!-- Describes the brush's color using
RGB values. Each value has a range of 0-255.
R is for red, G is for green, and B is for blue.
A is for alpha which controls transparency of the
color. Therefore, to make a completely transparent
color (invisible), use a value of 0 for Alpha. -->
<Color A="255" R="0" G="0" B="255" />