Hello bprego：）

【Reasons】

In fact I think you can use XmlDocument or LINQ-TO-XML and do a "nested" databinding。Something looks like this following：

【Solutions】

var result = from e in XDocument.Load("xxx.xml").Descedants("Floor")
             select new
             {
                   FloorName = e.Value,
                   DepartNames = from f in e.Descedants("Department")
                                 select f.Value
             }

And then your GridView should be something like this：

<asp:GridView id="GridView1" runat="server" AutoGenerateColumns="false">
 <Columns>
 <asp:Template HeaderText="FloorName"> 

 <ItemTemplate>
 <%#Eval("FloorName")%>
 </ItemTemplate>
 </asp:Template> 

 <asp:Template HeaderText="Departments"> 

 <ItemTemplate>

 <asp:GridView id="GridView1" runat="server" AutoGenerateColumns="false" DataSource='<%#Eval("Departments")%>'>

 <Columns>
  <ItemTemplate>
 <%#Eval("Department")%>
 </ItemTemplate> 

 </Columns>
 </ItemTemplate>
 </asp:Template> 

 </Columns>
</asp:GridView>

Your code-behind is：