Can't retrieve updated fields from Datagrid

[Mark Brown]

I'm new to ASP.NET and I'm trying to create an aspx page that retrieves info
from a database, let's the user make a change and write the change back. It
reads from the database just fine. The problem lies when you try to edit a
field. The change doesn't get passed back to the vb code. Here are code
fragments of what I'm trying to do:

Here is a part of the HTML dealing with one field...

<asp:TemplateCo lumn HeaderText="Reg Clerk">
<ItemStyle Wrap="False" HorizontalAlign ="Center"></ItemStyle>
<ItemTemplate >
<asp:Label Runat=server text='<%# Container.DataI tem("RegClerk") %>'
id="Label75">
</asp:Label>
</ItemTemplate>
<EditItemTempla te>
<asp:TextBox Enabled=True Width=50 CssClass="text" Runat="server"
ID="txtRegClerk " Text='<%# Container.DataI tem("RegClerk") %>' Wrap="false">
</asp:TextBox>
</EditItemTemplat e>
</asp:TemplateCol umn>

Here is the vb code that tries to retrieve the edited value in "RegClerk":

Dim RegClerk As String =
CType(Me.DataGr id1.Items(e.Ite m.ItemIndex).Fi ndControl("txtR egClerk"),
TextBox).Text

If there's already a value in the field, the original value comes through
OK. If you edit it, only the original value seems to be passed.

What am I missing?

Thanks,
Mark