Hi,

I m trying to play with web parts.

I would like to know if it's possible to create a connection between 3 web parts ?
here's my web parts.
WebPart A is a Gridview with the Customers list.
WebPart B is a Gridview with the Orders list (the orders are filtered by the customer Id)
WebPart C is a Gridview with the Details Order (and my goal is to display the detail of the order from the selection of B).

how to make the relation between B and C. (for A->B, it works for me).

Any help is really welcome.
Stan

Hi,

About the relation between the B and C should be similar to the relation between A and B.

Below is my test code helps.

1. Aspx code:

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ParentId"
                                DataSourceID="SqlDataSource1" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
                                <Columns>
                                    <asp:BoundField DataField="ParentId" HeaderText="ParentId" SortExpression="ParentId" />
                                    <asp:BoundField DataField="ParentName" HeaderText="ParentName" SortExpression="ParentName" />
                                    <asp:CommandField ShowSelectButton="True" />
                                </Columns>
                            </asp:GridView>
                            <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource2" OnSelectedIndexChanged="GridView2_SelectedIndexChanged" DataKeyNames="SubID">
                                <Columns>
                                    <asp:BoundField DataField="ParentId" HeaderText="ParentId" SortExpression="ParentId" />
                                    <asp:BoundField DataField="ChildName" HeaderText="ChildName" SortExpression="ChildName" />
                                    <asp:BoundField DataField="subID" HeaderText="subID" SortExpression="subID" />
                                    <asp:CommandField ShowSelectButton="True" />
                                </Columns>
                            </asp:GridView>
                            <asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource3" DataKeyNames="SubID">
                                <Columns>
                                    <asp:BoundField DataField="SubID" HeaderText="SubID" SortExpression="SubID" />
                                    <asp:BoundField DataField="SubName" HeaderText="SubName" SortExpression="SubName" />
                                </Columns>
                            </asp:GridView>

                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>"
                        SelectCommand="SELECT * FROM [ParentTable]"></asp:SqlDataSource>
                    <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>"  >
                    </asp:SqlDataSource>
                    <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>" > 
                    </asp:SqlDataSource>

 2. The code behind:

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        this.SqlDataSource2.SelectCommand = "SELECT * FROM [ChildTable] WHERE ([ParentId] = " + this.GridView1.SelectedDataKey.Value.ToString() + ")";
        this.GridView2.DataBind();
    }
    protected void GridView2_SelectedIndexChanged(object sender, EventArgs e)
    {
this.SqlDataSource3.SelectCommand = "SELECT * FROM [SubTable] WHERE ([SubID] = "+this.GridView2.SelectedDataKey.Value.ToString()+")";
this.GridView3.DataBind();

    }

 Notice, you should set the second gridview's datakey is the third gridview's key field.

 Hope it helps.