How to keep a field as read only in a gridview that allows updates

I have a gridview that updates the underlying data.  I used this for my starting point: http://msdn.microsoft.com/en-us/library/ms972948.aspx

One of the fields in the row needs to be left as "read only":
<asp:BoundField DataField="EmployeeID" ReadOnly="True" Visible="true" />

But here is the problem.  I don't want to show it on the gridview.  So if I change it to this...
<asp:BoundField DataField="EmployeeID" ReadOnly="True" Visible="false" />

...the value gets passed to the business and data tier as zero instead of its true value.  If I set it to true, it works just fine.

Is there a way gridview can be set up to just update certain fields, or is it an "all or nothing" deal?
ToolTimeGangAsked:
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Carl TawnSystems and Integration DeveloperCommented:
Is EmployeeID the key field? What happens if you just remove the BoundField from the grid completely?
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ToolTimeGangAuthor Commented:
No it is not the key field.  If I take it out, the value is 0.
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Carl TawnSystems and Integration DeveloperCommented:
I guess your other option is to use a TemplateField with a HiddenField:
<asp:TemplateField>
    <EditItemTemplate>
        <asp:HiddenField ID="HdnEmpID" runat="server" Value='<%# Bind("EmployeeID") %>'></asp:HiddenField>
    </EditItemTemplate>
    <ItemTemplate>
        <asp:HiddenField ID="HdnEmpID" runat="server" Value='<%# Bind("EmployeeID") %>'></asp:HiddenField>
    </ItemTemplate>
</asp:TemplateField>

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ToolTimeGangAuthor Commented:
Tried it like you have it above, but EmployeeID=0 once it gets to the busines tier.
If I change that first line to this...
<asp:TemplateField Visible="true">

...it works just fine.
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Carl TawnSystems and Integration DeveloperCommented:
So are you sorted then?
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ToolTimeGangAuthor Commented:
No.  Should I be?  Does it make a difference?
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Carl TawnSystems and Integration DeveloperCommented:
When you said it worked when you set Visible="true" i thought you meant it was now working.

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ToolTimeGangAuthor Commented:
Sorry for the confusion.  
This works:
                <asp:TemplateField Visible="true">
                    <EditItemTemplate>
                        <asp:HiddenField ID="HiddenField2" runat="server" Value='<%# Bind("EmployeeID") %>' />
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Bind("EmployeeID") %>' />
                    </ItemTemplate>
                </asp:TemplateField>

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This does not work:
                <asp:TemplateField Visible="false">
                    <EditItemTemplate>
                        <asp:HiddenField ID="HiddenField2" runat="server" Value='<%# Bind("EmployeeID") %>' />
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Bind("EmployeeID") %>' />
                    </ItemTemplate>
                </asp:TemplateField>

Open in new window

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Carl TawnSystems and Integration DeveloperCommented:
So I assume the issue is that you don't want to have the extra column showing since it only contains a hidden field?

I think you're only option is to convert a column (one that will be displayed) into a template and smuggle the hidden field into it's definition.
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ToolTimeGangAuthor Commented:
Happy dance!  That did the trick!  Thank you so very much...you made my day!
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ToolTimeGangAuthor Commented:
the promptness of the answers were appreciated so very much.  This was one of those things that you just can't put down until it is working.
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