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I ve been reading some event examples and i ve added an example of some code below, my question is (being a total newbee i.e. day 1) what do I save this file as and where do I save it to make use of

Sorry such a daft question but very new to this and keen to learn

Gibbo

using System;
using umbraco.BusinessLogic;
using umbraco.cms.presentation.Trees;
 
namespace OnlyForAdmins
{
    /// <summary>
    /// Makes a document invisible for writers
    /// </summary>
    public class MenuIsNotForWriters : ApplicationBase
    {
        /// <summary>
        /// Wire up the event handler
        /// </summary>
        public MenuIsNotForWriters()
        {
            BaseContentTree.AfterNodeRender += new BaseTree.AfterNodeRenderEventHandler(BaseContentTree_AfterNodeRender);
        }
 
        /// <summary>
        /// Removes node from menu tree if page is protected and the user is a writer
        /// </summary>
        void BaseContentTree_AfterNodeRender(ref XmlTree sender, ref XmlTreeNode node, EventArgs e)
        {
            //check if page is protecetd and the usertype is writer
            if (node.IsProtected.GetValueOrDefault(false) && umbraco.helper.GetCurrentUmbracoUser().UserType.Alias == "writer")
            {
                //Writers cannot see protected pages
                sender.Remove(node);
            }
        }
    }
}