How do I catch events from an SSIS package loaded in C#?

Microsoft.SqlServer.Dts.Runtime.SqlPackageEventListener sqlListener = new SqlPackageEventListener();
    Microsoft.SqlServer.Dts.Runtime.Application sqlPackageLoader = new Application();
    Microsoft.SqlServer.Dts.Runtime.Package sqlPackage = sqlPackageLoader.LoadPackage(@"pathMigrateData.dtsx", sqlListener);
    sqlPackage.Execute(null, null, sqlListener, null, null);

public class SqlPackageEventListener : DefaultEvents
{
    public SqlPackageChangedHandler OnPackageError;

    public override bool OnError(DtsObject source, int errorCode, string subComponent, string description, string helpFile, int helpContext, string idofInterfaceWithError) {
    	OnPackageError(this, new PackageErrorEventArgs(source, subComponent, description));
    	return base.OnError(source, errorCode, subComponent, description, helpFile, helpContext, idofInterfaceWithError);
    }

    public delegate void SqlPackageChangedHandler(
    	object sqlPackage,
    	EventArgs packageInfo
    	);
}

public class PackageErrorEventArgs : EventArgs
{
    private DtsObject source;
    public DtsObject Source {
    	get { return source; }
    	set { source = value; }
    }

    private string subcomponent;
    public string Subcomponent {
    	get { return subcomponent; }
    	set { subcomponent = value; }
    }

    private string description;
    public string Description {
    	get { return description; }
    	set { description = value; }
    }

    public PackageErrorEventArgs(DtsObject source, string subcomponent, string description) {
    	this.description = description;
    	this.source = source;
    	this.subcomponent = subcomponent;
    }
}

public class Test
{
    SqlPackageEventListener sqlListener = new SqlPackageEventListener();
    sqlListener.OnPackageError += new SqlPackageEventListener.SqlPackageChangedHandler(sqlListener_OnPackageError);
    Microsoft.SqlServer.Dts.Runtime.Application sqlPackageLoader = new Microsoft.SqlServer.Dts.Runtime.Application();
    Microsoft.SqlServer.Dts.Runtime.Package sqlPackage = Microsoft.SqlServer.Dts.Runtime.sqlPackageLoader.LoadPackage(@"path_tofile.dtsx", sqlListener);
    sqlPackage.Execute(null, null, sqlListener, null, null)

    public void sqlListener_OnPackageError(object sender, EventArgs args) {
    	//code to handle the event
    }
}