can't find label

Using a recursive find method, I have tried all day to find "lblName" below so I can add text property to it. Also tried all page lifecycle events; nothing. Master page follows. Find method found "Main Content" but not the label contained in it. Pretty standard stuff but it has me baffled. Any help would be appreciated.

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Checkout.aspx.cs" Inherits="Checkout" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">
    <div style="width: 900px; text-align: center;">
        <asp:Label ID="lblCheckout" Font-Size="Large" Text="Thank you for shopping. Order details:"
            runat="server" /><br />
        <asp:Label ID="lblName" Font-Size="Large" runat="server" />
        <asp:Label ID="lblPrice" Font-Size="Large" runat="server">$100</asp:Label>
    </div>
</asp:Content>

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Site.master.cs" Inherits="SiteMaster" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
    <title></title>
    <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
    <asp:ContentPlaceHolder ID="HeadContent" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form runat="server">
    <div class="page">
        <div class="header">
            <div class="title">
                <h1>
                    Pay 41 Demo
                </h1>
            </div>
            <div class="loginDisplay">
                <asp:LoginView ID="HeadLoginView" runat="server" EnableViewState="false">
                    <AnonymousTemplate>
                        [ <a href="~/Account/Login.aspx" id="HeadLoginStatus" runat="server">Log In</a>
                        ]
                    </AnonymousTemplate>
                    <LoggedInTemplate>
                        Welcome <span class="bold">
                            <asp:LoginName ID="HeadLoginName" runat="server" />
                        </span>! [
                        <asp:LoginStatus ID="HeadLoginStatus" runat="server" LogoutAction="Redirect" LogoutText="Log Out"
                            LogoutPageUrl="~/" />
                        ]
                    </LoggedInTemplate>
                </asp:LoginView>
            </div>
            <div class="clear hideSkiplink">
                <asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false"
                    IncludeStyleBlock="false" Orientation="Horizontal">
                    <Items>
                        <asp:MenuItem NavigateUrl="~/Default.aspx" Text="Home" />
                        <asp:MenuItem NavigateUrl="~/Products.aspx" Text="Products" />
                        <asp:MenuItem NavigateUrl="~/Checkout.aspx" Text="Checkout" />
                    </Items>
                </asp:Menu>
            </div>
        </div>
        <div class="main">
            <asp:ContentPlaceHolder ID="MainContent" runat="server" />
        </div>
        <div class="clear">
        </div>
    </div>
    <div class="footer">
    </div>
    </form>
</body>
</html>

Re: can't find label

try these:

protected void Page_Load(object sender, EventArgs e)
    {
        //you can do this
        lblName.Text = "foo";

        //or you can do this
        ((Label)Master.FindControl("MainContent").FindControl("lblName")).Text = "foo2";

    }

Re: can't find label

Thanks, but same error message. It's just not finding lblName. I even put in a panel; the find method found the panel just fine but not the label in the page or in the panel.

Re: can't find label

lblName is placed in your content page

so how you are accessing the label can you post your

code?

Re: can't find label

try this in your master page

since your control inside contentplaceholder so

ContentPlaceHolder ContentPlaceHolder1 = (ContentPlaceHolder) Page.Master.FindControl("MainContent");

Label lblName= (Label) ContentPlaceHolder1.FindControl("lblName");

Re: can't find label

I think you should try - this.Master.FindControl("lblName")

Or else, try looking your HTML source of your page in browser, and see what ID it generates for "lblName". That will give you idea of hierarchy. If you face any issues, please post the generated ID of lblName here.

Re: can't find label

I cannot believe it

even without using FindControl it should find the label.

Just lblName.Text = "foo"; should populate the label.

In which .cs file You write the code?

Re: can't find label

how lblName.text should work??

as i understand that he is trying to access child control from master page

and lblName is in child

Re: can't find label

No, i think "lblName" is placed in master page, and he is trying to access it from the child page.

Re: can't find label

I think you should move your controls out of ContentPlaceHolder.

ContentPlaceHolder is basically for child page's controls. I doubt any controls you put directly ContentPlaceHolder within master page are even getting rendered?

Do you see the other controls Price, and all while the page gets opened in browser?

Re: can't find label

nirman.doshi

no you are wrong look carefully to the code in the first snippet there is a directive call masterPagefile="" which means that this is a child or content and it has the label name

in the second snippet there is the master look at page directive the first thing is master.

so he want to access the child content from the master page .

Re: can't find label

Hello,

As far as I know, a simple code would do this

Master.FindControl("lblName");

Are you sure the labels get rendered on the webpage? Please check the code behind and verify that you are not setting those to Visible=false.

Re: can't find label

Oh sorry.. I misunderstood completely.

Re: can't find label

I think, you should be able to access it using -

this.MainContent.FindControl("lblInfo")

in Page_Load, or PreRender of Master page.

Re: can't find label

muybn

Thanks, but same error message. It's just not finding lblName. I even put in a panel; the find method found the panel just fine but not the label in the page or in the panel.

Please double check the solution i posted. I took the exact master page you posted as well as your exact content page and validated that what i posted works correctly. So unless you're doing something different than what you'd originally posted, it should work. If you do have something else going on beyond what you'd posted, you'll need to share what it is.

Re: can't find label

I discovered that the label is being found after all, even without the FindControl feature. The error was coming from a session variable that wasn't initializing. The problem has changed so if anyone wants to change gears and help with the following description, I would appreciate it.

The problem originates in the fact that when I click the lnkButton control and the lnk_Click event isn't accessed by the program. The flow in the code below goes from Products.aspx to Checkout.aspx. Any suggestions?

<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Products.aspx.cs"
    Inherits="About" Title="Select a Product" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <table width="900">
        <tr align="center">
            <td colspan="5" align="center">
                <asp:Image ID="imgLock" ImageUrl="~/i/wwb_img6.jpg" runat="server" />
                <h2>
                    Select a Product:
                </h2>
                <br />
            </td>
        </tr>
        <tr align="center">
            <td align="center">
                <asp:ImageButton ID="lnk1" AlternateText="Blackberry"
                    ImageUrl="~/i/Blackberry_s.jpg" PostBackUrl="~/Checkout.aspx"
                    runat="server" onclick="lnk_Click" /><br />
                <asp:Label ID="Label1" Text="Blackberry" runat="server" />
            </td>
            <td align="center">
                <asp:ImageButton ID="lnk2" AlternateText="HTC" ImageUrl="~/i/HTC_s.jpg" PostBackUrl="~/Checkout.aspx"
                    runat="server" onclick="lnk_Click" /><br /> <asp:Label ID="Label2" Text="HTC" runat="server" /> </td> <td align="center"> <asp:ImageButton ID="lnk3" AlternateText="LG" ImageUrl="~/i/LG_s.jpg" PostBackUrl="~/Checkout.aspx" runat="server" onclick="lnk_Click" /><br /> <asp:Label ID="Label3" Text="LG" runat="server" /> </td> </tr> </table> </asp:Content> //Products.aspx.cs: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Text; public partial class About : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void lnk_Click(object sender, ImageClickEventArgs e) //doesn't run
    {
        ImageButton  lnk = ((ImageButton)sender);
        if (lnk != null)
        {
            string text1 = lnk.AlternateText;
            Session["text"] = text1;
        }
    }

}



<%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Checkout.aspx.cs" Inherits="Checkout" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">
    <asp:Panel id="div" style="width: 900px; text-align: center;" runat="server">
        <asp:Label ID="lblCheckout" Font-Size="Large" Text="Thank you for shopping. Order details:"
            runat="server" /><br />
        <asp:Label ID="lblName" Font-Size="Large" runat="server" />
        <asp:Label ID="lblPrice" Font-Size="Large" Text="$100" runat="server" />
    </asp:Panel>
</asp:Content>



//Checkout.aspx.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Checkout : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label lbl = Util.FindChild(Page, "lblName") as Label; //label is being found OK
        if (lbl != null)
        {
            //error here because session variable didn't initialize in code above

            //lbl.Text = Session["text"].ToString();
        }
    }
}

Re: can't find label

muybn

PostBackUrl="~/Checkout.aspx"

Remove PostBackUrl property from ImageButtons and insert it inside your method as below

   protected void lnk_Click(object sender, ImageClickEventArgs e) //doesn't run
    {
        ImageButton  lnk = ((ImageButton)sender);
        if (lnk != null)
        {
            string text1 = lnk.AlternateText;
            Session["text"] = text1;
        }
        Response.Redirect("~/Checkout.aspx");
    }

Re: can't find label

Ruchira

muybn

PostBackUrl="~/Checkout.aspx"

Remove PostBackUrl property from ImageButtons and insert it inside your method as below

   protected void lnk_Click(object sender, ImageClickEventArgs e) //doesn't run
    {
        ImageButton  lnk = ((ImageButton)sender);
        if (lnk != null)
        {
            string text1 = lnk.AlternateText;
            Session["text"] = text1;
        }
        Response.Redirect("~/Checkout.aspx");
    }

I'm not sure why, but without any changes that I'm aware of, the lnk_Click event suddenly started being recognized (in other words, the breakpoint finally made the execution pause). I found that both the PostBackURL and the Response.Redirect commands worked equally well but I think I will use Response.Redirect along with a QueryString with it instead of the session variable. If the information to be passed were more secure, I would use a session variable but QueryString in this case, used without any sensitive information, will cut down on bandwidth. Thanks again to everyone for all your help.

Re: can't find label

You cannot have both, event and a postbackurl. When you specify a postbackulr, it will redirect to the specified page without firing the event. You can have a client click event. It will get fired because it will run BEFORE the server side code runs.