Adding an ASP.NET Web User Control to a Control Dynamically

Question

I have a simple ASP.NET Web User Control. It looks like this:

<%@ Control Language="C#" AutoEventWireup="true" 
    CodeBehind="NewsArticle.ascx.cs" 
    Inherits="Website.Controls.NewsArticle" %>

<div>
    <asp:Literal ID="ltlBody" runat="server" />
</div>

My code behind looks like this:

namespace Website.Controls
{
    public partial class NewsArticle : System.Web.UI.UserControl
    {
        public String bodyText
        {
            //get { return ltlBody.Text; }
            set { ltlBody.Text = value; }
        }
    }
}

On a .aspx page I have <asp:Panel ID="pNews" runat="server" />

In the code behind I have:

foreach (vwNews news in newsQuery)
{
    NewsArticle article = new NewsArticle();
    article.bodyText = news.Body;

    pNews.Controls.Add(article);
}

Every time I run this code the newsQuery is populated correctly and I get to the line aticle.bodyText = news.Body; and then I received the error article.bodyText threw an exception of type 'System.NullReferenceException'

I am not sure what is causing this error message or how to fix it. I would think that there should not be an issue. I tried creating a constructor for my Web User Control so that it would give default values to my properties but that didn't work. Any idea how to make this work? It doesn't seem like it should be that

Coding Flow · Accepted Answer · 2010-05-18 13:49:35Z

4

To load a control programatically you need to use the Page.LoadControl() method. See this MSDN article

answered May 18, 2010 at 13:49

Coding Flow

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3 Comments

Ben Hoffman Over a year ago

That was just a mistake caused by me cleaning out some data to make the question. That didn't cause the issue.

Coding Flow Over a year ago

@RandomBen, does the above comment relate to my post or did you add it by mistake. The answer i have given you is most likely the cause of your problem. The LoadControl method instantiates controls that are in the markup of the usercontrol, if you haven't use it prior to setting the property the literal control in the markup has not yet been instantiated which will give you the null reference exception.

Ben Hoffman Over a year ago

It was related to Marcus' post. My mistake, sorry!

marcusstarnes · Accepted Answer · 2010-05-18 13:46:19Z

-2

You have a typo within the code you've written. 'aticle' instead of 'article'.

answered May 18, 2010 at 13:46

marcusstarnes

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2 Comments

Julius A Over a year ago

It can't even compile with the typo :(

Ben Hoffman Over a year ago

That was just a mistake caused by me cleaning out some data to make the question. That didn't cause the issue.

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