Cannot Find Control ID in ControlParameter - asp.net

Question

I am trying to insert values from a textbox but I get an error that it cannot find the controlid in the controlparameter. The TextBox is inside a formview, which is inside a listview. The SqlDataSource is outside the ListView.
My InsertButton_Click Method
protected void InsertButton_Click(object sender, EventArgs e)
{
var ctrl = (Control)sender;
var formview = (FormView)ctrl.NamingContainer;
formview.ChangeMode(FormViewMode.Insert);
SectionListView.DataSource = SectionDataSource;
SectionListView.DataBind();
}
The InsertItem Template
<InsertItemTemplate>
<tr style="">
<td>
<div style="font-size: .8em;">
<asp:FormView ID="SectionFormView" runat="server" DataKeyNames="SectionItemID" DataSourceID="SectionDataSource">
<ItemTemplate>
<asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" OnClick="InsertButton_Click" Font-Size="1.2em" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" Font-Size="1.2em" />
<asp:Label ID="SectionItemLabel" runat="server" Text="SectionItem" Font-Bold="true" Font-Size="1.2em" />
<asp:TextBox ID="SectionItemTextBox" runat="server" />
<asp:Label ID="SectionItemSubLabel" runat="server" Text="SectionItem Label" Font-Bold="true" Font-Size="1.2em" />
<asp:TextBox ID="SectionItemLabelTextBox" runat="server"/>
</ItemTemplate>
</asp:FormView>
</div>
</td>
</tr>
</InsertItemTemplate>
My SqlDataSource
<asp:SqlDataSource ID="SectionDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:ORHP_Dev03182014ConnectionString %>" SelectCommand="SELECT DISTINCT SectionItem,SectionItemLabel,SectionItemID FROM Core.SectionItem_Lkup"
InsertCommand="INSERT INTO Core.SectionItem_Lkup(SectionItem, SectionItemLabel) VALUES (#SectionItem, #SectionItemLabel)">
<InsertParameters>
<asp:ControlParameter ControlID="SectionItemTextBox" Name="SectionItem" PropertyName="Text" />
<asp:ControlParameter ControlID="SectionItemLabelTextBox" Name="SectionItemLabel" PropertyName="Text" />
</InsertParameters>
</asp:SqlDataSource>

Answer 1

When you want to use the child controls as control parameters, you need to use the qualified id as control id. Try changing the SQL data source as below
<asp:SqlDataSource ID="SectionDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:ORHP_Dev03182014ConnectionString %>" SelectCommand="SELECT DISTINCT SectionItem,SectionItemLabel,SectionItemID FROM Core.SectionItem_Lkup"
InsertCommand="INSERT INTO Core.SectionItem_Lkup(SectionItem, SectionItemLabel) VALUES (#SectionItem, #SectionItemLabel)">
<InsertParameters>
<asp:ControlParameter ControlID="SectionFormView$SectionItemTextBox" Name="SectionItem" PropertyName="Text" />
<asp:ControlParameter ControlID="SectionFormView$SectionItemLabelTextBox" Name="SectionItemLabel" PropertyName="Text" />
</InsertParameters>
</asp:SqlDataSource>