How to find the nested Asp:GridView within the following code?

Question

I have the following structure in an aspx page:

<asp:Panel ID="pnlCust" runat="server">
    <asp:GridView ID="gvMaster" runat="server" 
                  OnRowCreated="gvMaster_RowCreated">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:Panel ID="pnlMaster" runat="server">
                        //...
                    </asp:Panel>
                    <asp:Panel ID="pnlDetails" runat="server">
                        <asp:GridView ID="gvDetails" runat="server">
                            <Columns>
                                //...
                            </Columns>
                        </asp:GridView>
                    </asp:Panel>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</asp:Panel>

The panels are used for the CollapsiblePanelExtender from the Ajax Control Toolkit.

I am trying to use FindControl to find the gvDetails control in code-behind, but my latest attempt has not worked, which is in the gvMaster_RowCreated event:

GridView gv =  
e.Row.FindControl("pnlDetails").FindControl("gvDetails") as GridView;

where e is GridViewRowEventArgs

I am basically doing what was on this page, but I am not using a SqlDataSource, however, the person is basically finding the SqlDataSource via the FindControl from the e argument passed in from the RowCreated event. Here is the link:

http://mosesofegypt.net/post/2008/02/Building-a-grouping-Grid-with-GridView-and-ASPNET-AJAX-toolkit-CollapsiblePanel.aspx

Answer 1

I don't believe that a GridView can have child controls like that.

Answer 2

You need to put the panel inside a template field. You can try something like this:

<asp:Panel ID="pnlCust" runat="server"> 
    <asp:GridView ID="gvMaster" runat="server" >
        <columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:Panel ID="pnlDetails" runat="server">
                        <asp:GridView ID="gvDtails" runat="server">
                            <columns>
                                <asp:TemplateField>
                                    <ItemTemplate>
                                        <%-- columns here --%>
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </columns>
                        </asp:GridView> <%-- end gvDetails --%>
                    </asp:Panel> <%-- end pnlDetails--%>
                </ItemTemplate>
            </asp:TemplateField>
        </columns>
    </asp:GridView> <%-- end gvMaster --%>
</asp:Panel> <%-- end pnlCust --%>

Answer 3

Here is a code behind method which worked for me:

protected void gvMaster_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow) {
        GridView gv = (GridView)e.Row.FindControl("gvDetails");
    }
}

Is your app throwing an exception? What is not working properly?

Answer 4

Hello Xaisoft, did you find the solution how to implement that?