Solved

FindControl nested within multiple controls

Posted on 2010-11-12
2
1,125 Views
Last Modified: 2012-06-27
I have a DropDownList which is located within a TemplateField of a DetailsView control which is in turn located within the EmptyDataTemplate of a GridView control. I am trying fruitlessly to locate the DDL via FindControl so that I can run commands against it/reference it within the Inserting command of a DataSource. Help :(

Here is the markup and below it I have used Stringbuilder to further determine all the parent objects of the control but I still cannot coerce FindControl into locating it...


<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="default.Account.WebForm1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
        DataKeyNames="contactid" DataSourceID="SDSTest1"
        onrowcommand="GridView1_RowCommand">
        <Columns>
            <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
            <asp:BoundField DataField="firstname" HeaderText="firstname"
                SortExpression="firstname" />
            <asp:BoundField DataField="middlename" HeaderText="middlename"
                SortExpression="middlename" />
            <asp:BoundField DataField="lastname" HeaderText="lastname"
                SortExpression="lastname" />
            <asp:BoundField DataField="contactid" HeaderText="contactid"
                InsertVisible="False" ReadOnly="True" SortExpression="contactid" />
            <asp:ButtonField CommandName="Insert" Text="New" />
        </Columns>
        <EmptyDataTemplate>
            <asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False"
                DataKeyNames="id" DataSourceID="SDSTest2" DefaultMode="Insert" Height="50px"
                Width="125px">
                <Fields>
                    <asp:BoundField DataField="id" HeaderText="id" InsertVisible="False"
                        ReadOnly="True" SortExpression="id" />
                    <asp:TemplateField HeaderText="contactid" SortExpression="contactid">
                        <EditItemTemplate>
                            <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("contactid") %>'></asp:TextBox>
                        </EditItemTemplate>
                        <InsertItemTemplate>
                            <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SDSTest2"
                                DataTextField="title" DataValueField="contactid">
                            </asp:DropDownList>
                        </InsertItemTemplate>
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server" Text='<%# Bind("contactid") %>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="title" HeaderText="title" SortExpression="title" />
                    <asp:CommandField ShowInsertButton="True" />
                </Fields>
            </asp:DetailsView>
            <asp:SqlDataSource ID="SDSTest2" runat="server"
                ConnectionString="<%$ ConnectionStrings:cmlmConnectionString1 %>"
                DeleteCommand="DELETE FROM [tblTest] WHERE [id] = @id"
                InsertCommand="INSERT INTO [tblTest] ([contactid], [title]) VALUES (@contactid, @title)"
                SelectCommand="SELECT [id], [contactid], [title] FROM [tblTest]"
                UpdateCommand="UPDATE [tblTest] SET [contactid] = @contactid, [title] = @title WHERE [id] = @id">
                <DeleteParameters>
                    <asp:Parameter Name="id" Type="Int32" />
                </DeleteParameters>
                <InsertParameters>
                    <asp:Parameter Name="contactid" Type="Int32" />
                    <asp:Parameter Name="title" Type="String" />
                </InsertParameters>
                <UpdateParameters>
                    <asp:Parameter Name="contactid" Type="Int32" />
                    <asp:Parameter Name="title" Type="String" />
                    <asp:Parameter Name="id" Type="Int32" />
                </UpdateParameters>
            </asp:SqlDataSource>
        </EmptyDataTemplate>
    </asp:GridView>
    <asp:SqlDataSource ID="SDSTest1" runat="server"
        ConnectionString="<%$ ConnectionStrings:sdsConnectionString1 %>"
        DeleteCommand="DELETE FROM [tblContacts] WHERE [contactid] = @contactid"
        InsertCommand="INSERT INTO [tblContacts] ([firstname], [middlename], [lastname]) VALUES (@firstname, @middlename, @lastname)"
        SelectCommand="SELECT [firstname], [middlename], [lastname], [contactid] FROM [tblContacts]"
        UpdateCommand="UPDATE [tblContacts] SET [firstname] = @firstname, [middlename] = @middlename, [lastname] = @lastname WHERE [contactid] = @contactid">
        <DeleteParameters>
            <asp:Parameter Name="contactid" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="firstname" Type="String" />
            <asp:Parameter Name="middlename" Type="String" />
            <asp:Parameter Name="lastname" Type="String" />
        </InsertParameters>
        <UpdateParameters>
            <asp:Parameter Name="firstname" Type="String" />
            <asp:Parameter Name="middlename" Type="String" />
            <asp:Parameter Name="lastname" Type="String" />
            <asp:Parameter Name="contactid" Type="Int32" />
        </UpdateParameters>
    </asp:SqlDataSource>
</asp:Content>


Stringbuilder output:

DropDownList1 (System.Web.UI.WebControls.DropDownList) ->
(System.Web.UI.WebControls.DataControlFieldCell) ->
(System.Web.UI.WebControls.DetailsViewRow) ->
(System.Web.UI.WebControls.ChildTable) ->
DetailsView1 (System.Web.UI.WebControls.DetailsView) ->
(System.Web.UI.WebControls.TableCell) ->
(System.Web.UI.WebControls.GridViewRow) ->
(System.Web.UI.WebControls.ChildTable) ->
GridView1 (System.Web.UI.WebControls.GridView) ->
MainContent (System.Web.UI.WebControls.ContentPlaceHolder) ->
(System.Web.UI.HtmlControls.HtmlForm) ->
(ASP.site_master) ->
__Page (ASP.account_webform1_aspx)
0
Comment
Question by:alright
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 12

Accepted Solution

by:
CmdoProg2 earned 125 total points
ID: 34123800
I set the cancel property to true for my testing..
The First is from DetailsView1_ItemInserting event where you can get the detailveiw fro the sender object.
The gridview has more control nodes since is has multiple rows and repeating cells(columns).  I have found gridviews and detailsviews as certain type of containers that has a single child control that contains all of their child controls. Therefore, you need to use DetailsView1.Controls[0] as the object to find controls on the DetailsView.

Try

protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e)
    {
      DropDownList ddl = (DropDownList)((DetailsView)(sender)).Controls[0].FindControl("DropDownList1");
      // Or 
      DetailsView dtv = (DetailsView)GridView1.Controls[0].Controls[0].Controls[0].FindControl("DetailsView1");
      DropDownList ddl2 =(DropDownList)dtv.Controls[0].FindControl("DropDownList1"); 
      e.Cancel = true;
    }

Open in new window

0
 

Author Closing Comment

by:alright
ID: 34124172
     DetailsView dtv = (DetailsView)GridView1.Controls[0].Controls[0].Controls[0].FindControl("DetailsView1");
      DropDownList ddl2 =(DropDownList)dtv.Controls[0].FindControl("DropDownList1");

Was exactly what I needed! Thank you!! And thank you for the explanation
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This demonstration started out as a follow up to some recently posted questions on the subject of logging in: http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Q_28634665.html and http://www.experts-exchange.com/Programming/…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question