LINQ to XML and GridView.ImageField

i am wanting to know how to add an image to a gridview based on the imageurl in a xml document. so far i have...

XDocument xmlDoc = XDocument.Load(Server.MapPath("XMLFile.xml"));

var q = from c in xmlDoc.Descendants("Images")
        where c.Element("PropertyId").Value.ToString() == DropDownList1.SelectedValue.ToString()
        select new
        {
            Id = c.Element("PropertyId").Value,
            Thumb = c开发者_如何学JAVA.Element("ThumbUrl").Value                
        };
GridView1.DataSource = q;
GridView1.DataBind();

which works fine to show the url in the thumb field but instead of showing this how do i change it an image field?

Markup:

<asp:GridView runat="server">
    <Columns>
        <ImageField DataImageUrlField="PhotoPath" />
    </Columns>
</<asp:GridView>

Code-behind:

string selectedValue =  DropDownList1.SelectedValue.ToString(); // cache it!
var q = from c in xmlDoc.Descendants("Images")
        where c.Element("PropertyId").Value.ToString() == selectedValue 
        select new
        {
            PhotoPath = c.Element("PhotoPath").Value         
        };

GridView1.DataSource = q;
GridView1.DataBind();

What is your problem?