问如何在WF7中删除图像

EN

List<Data> datasource = new List<Data>() 
        {
            new Data()
            {Text = "Chrysanthemum",ImageUri= "/Ima/Chrysanthemum.jpg"},
            new Data()
            {Text="Desert", ImageUri="/Ima/Desert.jpg"},
            new Data()
            {Text="Hydrangeas", ImageUri="/Ima/Hydrangeas.jpg"},
            new Data()
            {Text="Jellyfish", ImageUri="/Ima/Jellyfish.jpg"},
            new Data()
            {Text="Koala",ImageUri="/Ima/Koala.jpg"},
            new Data()
            {Text="Lighthouse", ImageUri ="/Ima/Lighthouse.jpg"},
            new Data()
            {Text="Penguins",ImageUri="/Ima/Penguins.jpg"},
            new Data()
            {Text="Tulips",ImageUri="/Ima/Tulips.jpg"}
        };
        this.listBox.ItemsSource = datasource;

     private void delete_Click(object sender, EventArgs e)
    {
       if (listbox.selectedItem!= null)

          ................
    }