[c#] Set background image on grid in WPF using C#

I have a problem: I want to set the image of my grid through code behind.

Can anybody tell me how to do this?

I have my images in a separate class library ("MyClassLibrary") and they are placed in the folder "Images". In the example I used "myImage.jpg" as the background image.

  ImageBrush myBrush = new ImageBrush();
  Image image = new Image();
  image.Source = new BitmapImage(
      new Uri(
         "pack://application:,,,/MyClassLibrary;component/Images/myImage.jpg"));
  myBrush.ImageSource = image.Source;
  Grid grid = new Grid();
  grid.Background = myBrush;          

All of this can easily be acheived in the xaml by adding the following code in the grid

<Grid>
    <Grid.Background>  
        <ImageBrush ImageSource="/MyProject;component/Images/bg.png"/>     
    </Grid.Background>
</Grid>

Left for you to do, is adding a folder to the solution called 'Images' and adding an existing file to your new 'Images' folder, in this case called 'bg.png'

In order to avoid path problem, you can simply try this, just keep background image in images folder and add this code

<Grid>
  <Grid.Background>
    <ImageBrush Stretch="Fill" ImageSource="..\Images\background.jpg"
                AlignmentY="Top" AlignmentX="Center"/>
  </Grid.Background>
</Grid>