OnItemSaved Event in Sitecore

namespace SitecoreEvents
{
    public class ItemSavedHandler
    {
        public void OnItemSaved(object sender, EventArgs args)
        {
            Item SavedItem = Event.ExtractParameter(args, 0) as Item;
            if (SavedItem != null && SavedItem.Database.Name.ToLower() == "master")
            {
                if (SavedItem.TemplateID == ID.Parse("<TemplateID>"))
                {
                    using (new SecurityDisabler())
                    {
                        // Do your action here
                    }
                }
            }
        }
    }
}

In web.config add below line.

<event name="item:saved">
   <handler type="SitecoreEvents.ItemSavedHandler, SitecoreEvents" method="OnItemSaved" />
</event>