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Editorial Team
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Asked: 2026-05-14T18:10:57+00:00

I have this code protected void Page_Load(object sender, EventArgs e) { DataSet.DestinationsDataTable GetDestinations =

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I have this code

 protected void Page_Load(object sender, EventArgs e)
{
    DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData();
    Page.Title = GetDestinations.Rows[0]["Meta_Title"].ToString();

    HtmlMeta hm = new HtmlMeta();
    HtmlHead head = (HtmlHead)Page.Header;
    hm.Name = GetDestinations.Rows[0]["Meta_Desc"].ToString();
    hm.Content = GetDestinations.Rows[0]["Meta_Key"].ToString();
    head.Controls.Add(hm);  
}

And it’s returning this error (on a content page)

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

Thoughts?

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1 Answer

  1. Editorial Team

    I don’t see what’s not clear from the error message.
    Your <head> tag contains a <% %> block, and therefore you cannot dynamically add controls there at runtime.

    To resolve this, add a placeholder and put your meta tags there:

    <html>
    <head>
        ...
        <asp:PlaceHolder runat="server" ID="metaTags" />
    </head>
...

    And then:

    protected void Page_Load(object sender, EventArgs e)
{
    DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData();
    Page.Title = GetDestinations.Rows[0]["Meta_Title"].ToString();

    HtmlMeta hm = new HtmlMeta();
    hm.Name = GetDestinations.Rows[0]["Meta_Desc"].ToString();
    hm.Content = GetDestinations.Rows[0]["Meta_Key"].ToString();
    this.metaTags.Controls.Add(hm);  
}
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