Sitecore Unversioned to Versioned media items

VersionButton.cs

using Sitecore.Data;
using Sitecore.Data.Items;
using Sitecore.Shell.Framework.Commands;

namespace MySite.Website.Utilities
{
    public class VersionButton: Command
    {
        Sitecore.Data.Database Master = Sitecore.Configuration.Factory.GetDatabase("master");

        public override void Execute(CommandContext context)
        {
            if (context.Items.Length == 0) return;
            Item item = context.Items[0];
            var templateItem = GetItem(item.TemplateID);
            var templatePath = templateItem.Paths.FullPath;
            var newPath = templatePath.Replace("Unversioned", "Versioned");
            var newTemplateId = GetItem(newPath);
            var newTemplate = Master.GetTemplate(newTemplateId.ID);
            using (new Sitecore.SecurityModel.SecurityDisabler())
            {
                item.Editing.BeginEdit();
                item.ChangeTemplate(newTemplate);
                item.Editing.AcceptChanges();
            }
        }

        public override CommandState QueryState(CommandContext context)
        {
            foreach (Item item in context.Items)
            {
                var templateItem = GetItem(item.TemplateID);
                if (templateItem != null &&!templateItem.Paths.FullPath.Contains("Unversioned"))
                {
                    return CommandState.Hidden;
                }
            }
            return base.QueryState(context);
        }

        private Item GetItem(string path)
        {
            return Master.GetItem(path);
        }

        private Item GetItem(ID itemId)
        {
            return Master.GetItem(itemId);
        }
    }
}