TemplateField and BoundField problem

I have used  TemplateField and BoundField:
<asp:BoundField HeaderText="Fileno" DataField="fileno" /> we have used  data field. in BoundField.
now for  TemplateField
<asp:TemplateField HeaderText="Department_Name" > <ItemTemplate> <asp:Label runat="server" ID="lbldptname"></asp:Label> </ItemTemplate> <EditItemTemplate> <asp:TextBox runat="server" ID="txtdptName"></asp:TextBox> </EditItemTemplate> </asp:TemplateField> I have used below  query to populate gridview:
"(select fileno, Department_name , ...