wpf - Fill color from property via XAML -

i learning wpf , have simple question.
how set fill color property vi xaml?

<rectangle fill="{binding path=backgroundcolorf}"             height="112" margin="0,84,0,0" verticalalignment="top"             width="116"/> 

public partial class mainwindow : window {           /// <summary>         /// gets or sets backgroundcolor.           /// </summary>    public solidcolorbrush backgroundcolorf    {        get;        set;    }     public mainwindow()    {        this.initializecomponent();        backgroundcolorf =  new solidcolorbrush(colors.red);     } } 

set datacontext this

public mainwindow()    {        this.datacontext = this;              this.initializecomponent();        backgroundcolorf =  new solidcolorbrush(colors.red);     } 

this should work.but there little more done making wpf app scalable notifications,dependency properties etc.i recommend go through basics of wpf databinding architecture before continuing.go through link posted h.b in comments