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FindControl() With MasterPages

Posted on 2008-10-30
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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
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Question by:grogo21
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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>

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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;

        }

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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

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