Unpublish scheduled page in Umbraco using Razor

Unpublish scheduled page in Umbraco using Razor

@inherits umbraco.MacroEngines.DynamicNodeContext
@using umbraco.BusinessLogic;
@using umbraco.cms.businesslogic.web;
@{
	var thisModel = @Model;
	foreach (var page in thisModel.Children)
	{
		var doc = new Document(page.Id);
		var publishAt = doc.ReleaseDate;
		var removeAt = doc.ExpireDate;
		if(removeAt.ToString() != “1/1/0001 12:00:00 AM”)
		{
			@(page.Name + ” has to be unpublished at ” + doc.ExpireDate) <br />
			if(removeAt  < DateTime.Now) {
			doc.UnPublish();
			doc.ExpireDate = DateTime.Parse(“1/1/0001 12:00:00 AM”);
			umbraco.library.RefreshContent();
			@(page.Name + ” has been unpublished”) <br />
			}
		}
	}
}