016 - PersonGridTagHelper.cs

public class PersonGridTagHelper : TagHelper
{
    [HtmlAttributeName("persons")]
    public IEnumerable<Person> Persons { get; set; }

    public override void Process(TagHelperContext context, TagHelperOutput output)
    {
        output.TagName = "table";
        output.Attributes.Add("class", "table");
        output.Content.AppendHtml("<tr>");
        output.Content.AppendHtml("<th>First name</th>");
        output.Content.AppendHtml("<th>Last name</th>");
        output.Content.AppendHtml("<th>Age</th>");
        output.Content.AppendHtml("<th>Email address</th>");
        output.Content.AppendHtml("</tr>");

        foreach (var person in Persons)
        {
            output.Content.AppendHtml("<tr>");
            output.Content.AppendHtml($"<td>{person.FirstName}</td>");
            output.Content.AppendHtml($"<td>{person.LastName}</td>");
            output.Content.AppendHtml($"<td>{person.Age}</td>");
            output.Content.AppendHtml($"<td>{person.EmailAddress}</td>");
            output.Content.AppendHtml("</tr>");
        }
    }
}