如何访问GetGlobalResourceObject()

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;


public class clsErrorMessages
{
    string _sErrors;
    public clsErrorMessages(string sErrorTextFileName)
    {
        _sErrors = (String)GetGlobalResourceObject("resource","FriendlyErrors.txt");

    }
}

编译器说 the name 'GetGlobalResourceObject' does not exist in the current context

using ?