I am passing a query string from a hyperlink navigate url to another page:

<asp:HyperLink ID="Department_ID" runat="server"ImageUrl='<%# String.Format("~/Images/button.png",Eval("Department_ID")) %>'

NavigateUrl='<%# "~/Department_Maps.aspx?Department_ID="+Eval("Department_ID") %>' Target="_parent">

On the other page I have GridView that I want to print an image based on the query string.  For example if the Department_ID= 2, I want o pull back the Map_Location with a Map_ID=2 from my table. Not sure how to set that up. Currently it is returning all the images in the table. Thanks

<asp:ImageField DataImageUrlField="Map_Location">

</asp:ImageField>