ASP.NET DataGridView Sorting Problem

[Queez]

OK, this is rediculous...

Surely, sorting should be one of the easiest things with the ASP.NET DataGridView control. I mean, there's hundreds of sites out there (Microsoft MSDN entries included) which explain and give examples of the DataGridView sorting and how to make it work...

SO WHY CAN'T I GET IT TO WORK?! Dammit!

Apologies for the rant. I'll try and keep it to the point from here on in:

I have tried the following:

• I have an object with a "ListComponents " function that I wrote to return a DataTable for my data source. When sorting didn't work using that, I tried...
• ...researching it a bit, so I checked out the MSDN stuff (http://msdn.microsoft. com/en-us/library/system.web.ui.w ebcontrols.grid view.sortexpres sion.aspx) and basically copied the code (including the SqlDataSource), except substituding my connection string and SQL select statements where applicable...
• ... This didn't work, so I went back to my original idea and tried mucking about with If Not IsPostBacks and various other things...
• ... This didn't work, so I looked on the web some more, and everyone seems to be saying that it should just WORK!

I've had a good amount of success on this site, so I'm hoping someone will be able to help me.

Here is my code (for what it's worth)..:

ASP Code:

<asp:DataGrid AutoGenerateColumns="false" AllowPaging="true" AllowSorting="true" ID="dgvComponents" runat="server">
    <Columns>
        <asp:BoundColumn HeaderText="ID" DataField="ID" Visible="False" ReadOnly="true" SortExpression="ID"></asp:BoundColumn>
        <asp:BoundColumn HeaderText="Part Reference" DataField="SPARE_REF" ReadOnly="true" SortExpression="SPARE_REF"></asp:BoundColumn>
        <asp:BoundColumn HeaderText="Part Name" DataField="NAME" ReadOnly="true" SortExpression="NAME"></asp:BoundColumn>
    </Columns>
</asp:DataGrid>
 

Code Behind:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
    dgvComponents.DataSource = Component.ListComponents()
    dgvComponents.DataBind()
 
End Sub
 

And, like, Component.ListC omponents basically just returns a DataTable with the following as the select string:

SELECT ID, NAME, SPARE_REF FROM COMPONENTS

Incidentally, I also tried adding a "sortExpression " parameter to ListComponents, e.g.:

ListComponents("ORDER BY ID ASC")

When I mentioned that I was playing around with IsPostBack, here's an example:

If Not IsPostBack Then
     dgvComponents.DataSource = Component.ListComponents()
End If
 

(I thought perhaps I'm only supposed to set the DataSource first-time-round. This actually made the whole table disappear when I click a header...!

With regards to the results I get, basically, you click on a header (either NAME or PART REFERENCE) and nothing happens. I'd expect it to alternate between Ascending and Descending =)

Thanks for your time, in advance.

-Q