C# 是否必须处置以下SharePoint对象？

我想确保SharePoint中没有内存泄漏，所以完成后是否需要为以下SharePoint对象调用dispose？我想我不应该这么做，因为我没有创建新的和使用GetCurrent，但是使用SharePoint很难说

Microsoft.SharePoint.WebControls.SiteActions siteActions 
    = SiteActions.GetCurrent(this.Page);

Microsoft.SharePoint.WebControls.PageStateActionButton psab 
    = PageStateActionButton.GetCurrent(this.Page);

Microsoft.SharePoint.WebControls.SPRibbon ribbon 
    = Microsoft.SharePoint.WebControls.SPRibbon.GetCurrent(this.Page);