Adding meta tags to News Items using script tags in widget t

I'm trying to add meta tags to News items using script tags in the widget template.

We are currently doing this for blog posts. There's a script tag that pulls a blog post's Title, Summary and ImageURL and creates Open Graph tags using them. I'm trying to replicate this code for News Items. I need help with the following:

1) What assemblies do I need to reference?
2) How should I write the method, what arguments should I use?
3) How should I define var data?

Here is the blog post widget code I'm trying to replicate and translate for News Item

BLOG

<%@ Control Language="C#" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.ContentUI" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.PublicControls.BrowseAndEdit" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Blogs.Model" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Model" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Taxonomies" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Taxonomies.Model" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.OpenAccess" Assembly="Telerik.Sitefinity" %>
<%@ Register Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Modules.Comments.Web.UI.Frontend" TagPrefix="comments" %>
<%@ Import Namespace="Telerik.Sitefinity" %>
<%@ Import Namespace="Telerik.Sitefinity.Modules.Comments" %>

<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Security" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Security.Model" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Security.Claims" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Modules.Libraries" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Modules.GenericContent" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.GenericContent.Model" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Services" Assembly="Telerik.Sitefinity" %>
  
<script type="C#" runat="server">

  protected void Page_Load(object sender, EventArgs e)

       

  
  
  protected void Repeater_ItemDataBound(object sender, Telerik.Web.UI.RadListViewItemEventArgs e) 
       
      var data = ((RadListViewDataItem)e.Item).DataItem as BlogPost;
      var placeholder = e.Item.FindControl("tags") as Literal;
          placeholder.Text = RenderFlatTaxaAsLink(data, "Tags");
            
HtmlMeta metaImage = new HtmlMeta();
metaImage.Attributes.Add("property", "og:image");          
metaImage.Name = "og:image";
metaImage.Content = data.GetValue("ImageURL").ToString();
this.Page.Header.Controls.Add(metaImage);

HtmlMeta metaTitle = new HtmlMeta();
metaTitle.Attributes.Add("property", "og:title");          
metaTitle.Name = "og:title";
metaTitle.Content = data.GetValue("Title").ToString() + " | APICS Blog";
this.Page.Header.Controls.Add(metaTitle);

HtmlMeta metaDescription = new HtmlMeta();
metaDescription.Attributes.Add("property", "og:description");          
metaDescription.Name = "og:description";
metaDescription.Content = data.GetValue("Description").ToString();
this.Page.Header.Controls.Add(metaDescription);