vb.net - WPF load background image on form -

hey have following code supposed take jpg image , place on background of form. however, see black background.

dim mybrush new imagebrush() dim image new image() dim grid new grid()  image.source = new bitmapimage(new uri("pack://application:,,,/wpfapplication1;component/resources/1680-logoless.jpg")) mybrush.imagesource = image.source grid.background = mybrush 

and current xaml:

<window x:class="mainwindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"         xmlns:local="clr-namespace:wpfapplication1"         mc:ignorable="d"         title="mainwindow" height="350" width="525">     <grid>         <textbox x:name="textbox1" horizontalalignment="left" height="23" textwrapping="wrap" text="textbox" verticalalignment="top" width="120" margin="157,145,0,0"/>         <label x:name="label1" content="label" horizontalalignment="left" margin="68,59,0,0" verticalalignment="top" width="111"/>         <button x:name="button" content="button" horizontalalignment="left" verticalalignment="top" width="75" margin="335,62,0,0"/>         <button x:name="button1" content="encrypt" horizontalalignment="left" height="17" margin="335,123,0,0" verticalalignment="top" width="120"/>         <textbox x:name="toencrypt" horizontalalignment="left" height="23" textwrapping="wrap" text="textbox" verticalalignment="top" width="172" margin="335,145,0,0"/>         <textbox x:name="todecrypt" horizontalalignment="left" height="23" textwrapping="wrap" text="textbox" verticalalignment="top" width="172" margin="335,173,0,0"/>         <button x:name="button2" content="decrypt" horizontalalignment="left" height="23" margin="335,201,0,0" verticalalignment="top" width="120"/>      </grid> </window> 

anyone see missing?

set x:name attribute of grid in xaml, create field in mainwindow class:

<window ...>     <grid x:name="rootgrid">         ...     </grid> </window> 

then, instead of creating new grid instance, set background of 1 declared in xaml:

rootgrid.background = new imagebrush(new bitmapimage(     new uri("pack://application:,,,/resources/1680-logoless.jpg")))