How to set the foreground property of a TextBlock in C# for Windows Phone -

for reason having problem setting foreground of textblock.

i've tried:

• new solidcolorbrush(windows.ui.color); there no color.white or colors matter.
• i can't find brushes.color class

i'm working on windows phone 8.1 app.

it must colors class (but not color). example:

var textblocks = new textblock() { height = box_height, width = box_width, text = "hello", fontsize = 30, foreground = new solidcolorbrush(colors.black) };