[SerializableAttribute()] 
public class TagCollection : System.Collections.ObjectModel.KeyedCollection<string,Tag> 

using Dynamicweb.Rendering;

namespace Dynamicweb.Examples.CSharp.Rendering
{
    public class TagSample
    {

        public static void AddTags(Template t)
        {
            //Create a tag instance and add it to a template instance
            var myTag = new Tag("greeting", "Hello");
            t.Tags.Add(myTag);
            //Create a second tag instance using its Name and Value properties and add it to a template instance
            var myTag2 = new Tag();
            myTag2.Name = "greeting2";
            myTag2.Value = " World!";
            t.Tags.Add(myTag2);

            //Create a collection of tags and add it to a template instance
            var myTags = new TagCollection();
            for (int i = 1; i <= 5; i++)
            {
                myTags.Add(new Tag("Counter" + i.ToString(), i.ToString()));
            }
            t.Tags.Add(myTags);

            //Examine all the tags in the template instance.
            foreach (Tag tag in t.Tags)
            {
                if (tag.Name == "greeting")
                {
                    //Found the tag in the collection named "greeting"
                }
            }

            //Or look it up
            if (t.Tags.ContainsTagName("greeting"))
            {
                //Found the tag in the collection named "greeting"
            }

            //And clear all tags from the template instances tags collection
            t.Tags.Clear();
        }
    }
}