Solved

FindControl() With MasterPages

Posted on 2008-10-30
7
637 Views
Last Modified: 2013-11-08
Hello, Im tring to find a control inside a master page contentplaceholder with the following:

                Dim TargetImage As HyperLink
                TargetImage = FindControl("Content2").FindControl("Image" & i)

I get object reference not set to an instance of an object.  I also tried:
                TargetImage = Me.Master.FindControl("Content2").FindControl("Image" & i)

The controls are not in the master page but in a page that uses the master page.  It did work before adding utalizing master pages also.  How can i fix this?

Thanks,

Greg
0
Comment
Question by:grogo21
  • 4
  • 3
7 Comments
 
LVL 8

Expert Comment

by:dampsey
ID: 22842123
Assuming Content2 is the name of the master page contentplaceholder name,

Can you please try the following:
TargetImage = Me.Master.FindControl("Image" & i)

0
 

Author Comment

by:grogo21
ID: 22842299
That did not work. I have attached the source code for my page.

Thanks!
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
        <div class="HeaderContentDiv">
            <asp:Label ID="WelcomeLabel" CssClass="WelcomeLabel" runat="server" Text=""></asp:Label><br /></div>
            
        <div class="GalleryContentDiv">
            <table>
                <tr valign="middle">
                    <td><asp:HyperLink ID="Image1" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image2" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image3" runat="server" visible="false" CssClass="ImageTR"/></td>
                </tr>
                <tr class="ImageTR" valign="middle">
                    <td><asp:HyperLink ID="Image4" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image5" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image6" runat="server" visible="false" CssClass="ImageTR"/></td>
                </tr>
                <tr valign="middle" align="center">
                    <td colspan="3" align="center" style="padding:5px; text-align:center;"><asp:HyperLink ID="Banner1" runat="server" visible="false" Target="_blank" CssClass="BannerImg"/></td>
                </tr>
                <tr class="ImageTR" valign="middle">
                    <td><asp:HyperLink ID="Image7" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image8" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image9" runat="server" visible="false" CssClass="ImageTR"/></td>
                </tr>
                <tr class="ImageTR" valign="middle">
                    <td><asp:HyperLink ID="Image10" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image11" runat="server" visible="false" CssClass="ImageTR"/></td>
                    <td><asp:HyperLink ID="Image12" runat="server" visible="false" CssClass="ImageTR"/></td>
                </tr>
....
            </table>
        </div>
</asp:Content>

Open in new window

0
 
LVL 8

Accepted Solution

by:
dampsey earned 500 total points
ID: 22842363
place the below code anywhere in your code.

then use the following

FindControlRecursive(this.Page, "Image" + i)

I know the following is written in c# but you may change it to vb easily
        public static Control FindControlRecursive(Control Root, string Id)
        {
            if (Root.ID == Id)
                return Root;
 
            foreach (Control Ctl in Root.Controls)
            {
                Control FoundCtl = FindControlRecursive(Ctl, Id);
                if (FoundCtl != null)
                    return FoundCtl;
            }
 
            return null;
        }

Open in new window

0
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 

Author Comment

by:grogo21
ID: 22842523
Still get Object reference not set to an instance of an object.

Thanks
0
 
LVL 8

Expert Comment

by:dampsey
ID: 22847962
In which event of the page you are using the FindControl function?
0
 

Author Comment

by:grogo21
ID: 22860202
PageLoad event
0
 

Author Comment

by:grogo21
ID: 22860332
This appears to work:
                TargetImage = DirectCast(DirectCast(Master.FindControl("ContentPlaceHolder1"), ContentPlaceHolder).FindControl("Image" & i.ToString), HyperLink)


Thanks!
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

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

User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

776 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