GridView, SQL and Parameters - asp.net

Question

I present to you my issues (And i apologize for my english ...):
I have a GridView containing the data of my database, from two SqlDataSource, one for my simple items and the second for a dropdown list.
They are:
<asp:SqlDataSource ID="source_personnes" runat="server"
ConnectionString="<%$ ConnectionStrings:Formation_2014ConnectionString %>"
SelectCommand="SELECT Personnes.id_personne, Personnes.nom_personne, Personnes.prenom_personne, Personnes.actif_personne, Personnes.agence_personne, Organismes.raison_sociale FROM Personnes INNER JOIN Organismes ON Personnes.agence_personne = Organismes.id_organisme WHERE (Personnes.actif_personne = 1)"
UpdateCommand="UPDATE Personnes SET nom_personne=#nom_personne, prenom_personne=#prenom_personne, agence_personne = #id_organisme WHERE (id_personne = #id_personne) "
DeleteCommand="UPDATE Personnes SET actif_personne = 0 WHERE (id_personne = #id_personne)">
<SelectParameters>
<asp:Parameter DefaultValue="1" Name="actif_personne" Type="Int16" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter Name ="id_organisme" ControlId="id_organisme" />
</UpdateParameters>
</asp:SqlDataSource>
The second one :
<asp:SqlDataSource ID="source_organisme" runat="server"
ConnectionString="<%$ ConnectionStrings:Formation_2014ConnectionString %>"
SelectCommand="SELECT * FROM [Organismes]">
</asp:SqlDataSource>
To explain things, I have the following two tables in my database :
Personnes ( id_personne(PK), nom_personne, prenom_personne, actif_personne, #agence_personne)
Organismes ( id_organisme(PK), raison_sociale, actif_organisme)
agence_personne related to id_organisme.
My goal is by the integrated update function of the GridView, change my entry in the database for the table Personnes.
Thanks to Tuto found on MSDN, here or here, I managed to built my dropdown list, however once you get to step 19 to 20 not for me to make a data bindings as explained. So I have a completely independent list.
I now give you the code for my GridView:
<asp:GridView ID="GridModif" runat="server" AllowPaging="True" AutoGenerateColumns="False"
DataKeyNames="id_personne" DataSourceID="source_personnes" SkinID="dataGrid">
<Columns>
<asp:TemplateField HeaderText="id" SortExpression="id_personne">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("id_personne") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("id_personne") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="nom_personne" HeaderText="Nom" SortExpression="nom_personne" />
<asp:BoundField DataField="prenom_personne" HeaderText="Prénom" SortExpression="prenom_personne" />
<asp:TemplateField HeaderText="Agence" SortExpression="raison_sociale">
<EditItemTemplate>
<asp:DropDownList ID="id_organisme" runat="server"
DataSourceID="source_organisme" DataTextField="raison_sociale"
DataValueField="id_organisme" AutoPostBack="True">
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="id_organisme" runat="server" Text='<%# Bind("raison_sociale") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="true" />
<asp:CommandField ShowDeleteButton="true" DeleteText="Désactiver" />
</Columns>
</asp:GridView>
My ultimate goal: When I click on my "Edit" button, the selected item in my list is the ID from the table Personne, I would select an element from the "Organismes" table and use it in my update parameters to update the "Personnes" table .
I posted that on other french forum, but i have no answer, I hope you could help me more !
-- Edit --
I've forgot to post my error ><
-> System.InvalidOperationException: Can not find control 'id_organisme' in ControlParameter 'id_organisme
Thanks a lot,
Krishnak

Answer 1

I finally found !
So on my DropDown List, I'd Bind a selected value :
<asp:TemplateField HeaderText="Agence" SortExpression="raison_sociale">
<EditItemTemplate>
<asp:DropDownList ID="agence_personne" runat="server"
DataSourceID="source_organisme" DataTextField="raison_sociale"
DataValueField="id_organisme" AutoPostBack="True"
SelectedValue='<%# Bind("agence_personne") %>' >
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="agence_personne" runat="server" Text='<%# Bind("raison_sociale") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
And I just remove the Update Parameters in my SqlDataSource. After that, my update works perfectly !