Eventhandler to trigger notification after installation

PackageInstallationEvent.cs

using Sitecore.Events;
using Sitecore.Install.Events;
using System;

public class PackageInstallationEvent
{
	public void OnPackageInstallItemsEndHandler(object sender, EventArgs e)
	{
		if (e == null)
		{
			return;
		}

		var sitecoreEventArgs = e as SitecoreEventArgs;

		if (sitecoreEventArgs == null || sitecoreEventArgs.Parameters == null || sitecoreEventArgs.Parameters.Length != 1)
		{
			return;
		}

		var parameter = sitecoreEventArgs.Parameters[0] as InstallationEventArgs;

		if (parameter == null || parameter.ItemsToInstall == null)
		{
			return;
		}                     

		Context.ClientPage.ClientResponse.Eval("scForm.postMessage(\"" + ("cms:notification(eventName=package:end)") + "\")");
	}
}