Gridview sorting with custom template fields
I had the same issue, the BoundField was sorting as it should, but the TemplateField did not sort at all.
I changed this:
<asp:TemplateField SortExpression="Category"> <HeaderTemplate>Category</HeaderTemplate> <ItemTemplate>A value</ItemTemplate></asp:TemplateField>To this:
<asp:TemplateField HeaderText="Category" SortExpression="Category"> <ItemTemplate>A value</ItemTemplate></asp:TemplateField>I removed the HeaderTemplate and added the HeaderText in the TemplateField.
Make sure you specify the SortExpression property on the template field
<asp:TemplateField HeaderText="Object Category ID" SortExpression="ObjectCategoryID"><ItemTemplate> <asp:Label ID="lblItems" runat="server" Text='<%# GetItems((int)DataBinder.Eval(Container.DataItem, "ObjectCategoryID"))%>' /></ItemTemplate></asp:TemplateField>