Can't "Enable Editing" on my gridview - asp.net

Question

I'm trying to connect my gridview to a LinqDataSource to select, update, insert and delete records. I am able to get into edit mode and cancel out of edit mode but when I click update nothing happens.
I've found a few things online that say to check the "Enable Editing" box in the gridview smart tag but when I go into the smart tag the only check boxes that appear are: Enable Paging, Enable Sorting and Enable selection. The others don't appear. Dose anyone see a problem with what I am doing below?
<asp:GridView ID="gv_Personnel"
runat="server"
OnRowDataBound="gv_Personnel_DataBind"
AutoGenerateColumns="False"
ShowFooter="True"
DataKeyNames="BudgetLineID"
AutoGenerateEditButton="True"
AutoGenerateDeleteButton="True"
DataSourceID="lds_Personnel"
>
<Columns>
<asp:BoundField HeaderText="Level of Staff" DataField="LineDescription" />
<asp:BoundField HeaderText="Hrs/Units requested" DataField="NumberOfUnits" />
<asp:BoundField HeaderText="Hrs/Units of Applicant Cost Share" DataField="" NullDisplayText="0" />
<asp:BoundField HeaderText="Hrs/Units of Partner Cost Share" DataField="" NullDisplayText="0" />
<asp:BoundField FooterStyle-Font-Bold="true"
FooterText="TOTAL PERSONNEL SERVICES:" HeaderText="Rate"
DataFormatString="{0:C}" DataField="UnitPrice" >
<FooterStyle Font-Bold="True" />
</asp:BoundField>
<asp:TemplateField HeaderText="Amount Requested"
ItemStyle-HorizontalAlign="Right" FooterStyle-HorizontalAlign="Right"
FooterStyle-BorderWidth="2" FooterStyle-Font-Bold="true">
<FooterStyle BorderWidth="2px" Font-Bold="True" HorizontalAlign="Right" />
<ItemStyle HorizontalAlign="Right" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Applicant Cost Share"
ItemStyle-HorizontalAlign="Right" FooterStyle-HorizontalAlign="Right"
FooterStyle-BorderWidth="2" FooterStyle-Font-Bold="true">
<FooterStyle BorderWidth="2px" Font-Bold="True" HorizontalAlign="Right" />
<ItemStyle HorizontalAlign="Right" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Partner Cost Share"
ItemStyle-HorizontalAlign="Right" FooterStyle-HorizontalAlign="Right"
FooterStyle-BorderWidth="2" FooterStyle-Font-Bold="true">
<FooterStyle BorderWidth="2px" Font-Bold="True" HorizontalAlign="Right" />
<ItemStyle HorizontalAlign="Right" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Total Projet Cost"
ItemStyle-HorizontalAlign="Right" FooterStyle-HorizontalAlign="Right"
FooterStyle-BorderWidth="2" FooterStyle-Font-Bold="true">
<FooterStyle BorderWidth="2px" Font-Bold="True" HorizontalAlign="Right" />
<ItemStyle HorizontalAlign="Right" />
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:LinqDataSource ID="lds_Personnel" runat="server"
ContextTypeName="nrm.FRGPproposal.FrgpropDataContext"
Select="new (BudgetLineID, UnitPrice, LineDescription, NumberOfUnits)"
TableName="BudgetLines"
Where="ProposalID == #PropNumber && BudgetLineTypeCode == #BudgetLineTypeCode"
EnableDelete="True" EnableInsert="True" EnableUpdate="True">
<WhereParameters>
<asp:SessionParameter Name="PropNumber" SessionField="PropNumber" Type="Int32" />
<asp:Parameter DefaultValue="S" Name="BudgetLineTypeCode" Type="Char" />
</WhereParameters>
</asp:LinqDataSource>

Answer 1

Did you try it without using anonymous types? In code, you can't update anon. types in the database...

Answer 2

Looks like this was caused by me having the Select value set on my LinqDataSoruce. See updated LDS below:
<asp:LinqDataSource ID="lds_Personnel" runat="server"
ContextTypeName="nrm.FRGPproposal.FrgpropDataContext"
TableName="BudgetLines"
Where="ProposalID == #PropNumber && BudgetLineTypeCode == #BudgetLineTypeCode"
EnableDelete="True" EnableInsert="True" EnableUpdate="True">
<WhereParameters>
<asp:SessionParameter Name="PropNumber" SessionField="PropNumber" Type="Int32" />
<asp:Parameter DefaultValue="S" Name="BudgetLineTypeCode" Type="Char" />
</WhereParameters>
</asp:LinqDataSource>