Getting invalid character error when deleting a gridview row - asp.net

Question

I was assigned to convert some .Net projects in old version to to .net 4.0 version. I used ODAC driver replacing ODBC driver. Everything went fine until I found a problem with a gridview were I get illegal character Oracle exception when I try to delete a row. The gridview is inside an update panel. The exception I receive is Microsoft Jscript run time error:Sys.WebForms.PageRequestManagerServerErrorException: ORA-00911:invalid character. The following is the code for the grid view and the sqldatasource. The linkbutton triggers the delete using the deleteparameters of the sqldatasource.
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<Columns>
<asp:TemplateField HeaderText="View">
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# Eval("CODE_OWNER_ID", "default.aspx?id={0}") %>'>View</asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="CODE_OWNER_ID" Visible ="False" HeaderText="CODE OWNER ID" />
<asp:BoundField DataField="CODE_TYPE" ReadOnly ="True" HeaderText="CODE TYPE" />
<asp:BoundField DataField="CODE" ReadOnly="True" HeaderText="CODE" />
<asp:BoundField DataField="UNIT_CODE" ReadOnly ="True" HeaderText="UNIT CODE" />
<asp:BoundField DataField="UNIT_NAME" ReadOnly="True" HeaderText="UNIT NAME" />
<asp:BoundField DataField="UNIT_DO" ReadOnly="True" HeaderText="UNIT DO" />
<asp:BoundField DataField="OWNER" ReadOnly="True" HeaderText="OWNER" />
<asp:BoundField DataField="OWNER_EMAIL" ReadOnly="True" HeaderText="OWNER EMAIL" />
<asp:BoundField DataField="OWNER_PHONE" ReadOnly="True" HeaderText="OWNER PHONE" />
<asp:BoundField DataField="OWNER_MAILPOINT" ReadOnly="True" HeaderText="OWNER MAILPOINT" />
<asp:BoundField DataField="CODE_ESTABLISHED_DATE" ReadOnly="True" DataFormatString="{0:MM/dd/yyyy}" HeaderText="CODE ESTABLISHED DATE" />
<asp:BoundField DataField="LAST_REVIEW_DATE" ReadOnly="True" DataFormatString="{0:MM/dd/yyyy}" HeaderText="LAST REVIEW DATE" />
<asp:BoundField DataField="REVIEW_USERNAME" ReadOnly="True" HeaderText="REVIEW USERNAME" />
<asp:BoundField DataField="CODE_DELETED_DATE" ReadOnly="True" DataFormatString="{0:MM/dd/yyyy}" HeaderText="CODE DELETED DATE" />
<asp:BoundField DataField="DELETE_REASON" ReadOnly="True" HeaderText="DELETE REASON" />
<asp:BoundField DataField="UPDATE_USERNAME" ReadOnly="True" HeaderText="UPDATE USERNAME" />
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Delete"
Text='Delete'
OnClientClick="return confirm('Are you sure you want to delete this record?');"
CommandArgument='<%# bind("CODE_OWNER_ID") %>'></asp:LinkButton>
</ItemTemplate>
<ItemStyle Wrap="False" />
</asp:TemplateField>
</Columns>
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" ForeColor="Navy" Font-Bold="True" />
<HeaderStyle BackColor="#990000" Font-Bold="True" HorizontalAlign="Center" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
</asp:GridView>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnAdd" />
</Triggers>
</asp:UpdatePanel>
<asp:SqlDataSource ID="Sqldatasource1" runat="server" ConnectionString="<%$ ConnectionStrings:Conn_Code_Owner %>"
ProviderName="<%$ ConnectionStrings:Conn_Code_Owner.ProviderName %>"
OldValuesParameterFormatString="original_{0}"
SelectCommand="SELECT * FROM CODE_OWNER"
DeleteCommand="DELETE FROM CODE_OWNER WHERE CODE_OWNER_ID = ?"
OnSelecting="_data_Selecting"
ConflictDetection="CompareAllValues" >
<DeleteParameters>
<asp:Parameter Name="Original_CODE_OWNER_ID" Type="Decimal"/>
</DeleteParameters>
</asp:SqlDataSource>

Answer 1

Try and wrap it w/ a Begin and End
BEGIN CODE_OWNER WHERE CODE_OWNER_ID = ? END
http://www.lazyasscoder.com/Article.aspx?id=89&title=ora-00911%3A+invalid+character+when+executing+multiple+Oracle+SQL+statements

Answer 2

I found an easy alternative using row-deleting event of the grid-view. I Just removed the delete parameters in the sqldatasource of asp page and then I set conflict-detection to overwrite-changes.
Sqldatasource1.DeleteCommand = "DELETE FROM code_owner WHERE code_owner_ID = :original_code_owner_ID"
Sqldatasource1.DeleteParameters.Add("original_code_owner_ID", GridView1.DataKeys(e.RowIndex).Values("code_owner_ID").ToString)
Sqldatasource1.Delete()
GridView1.DataBind()