关于WebService的声明部分,该怎么处理

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.IO;

namespace WebServiceSkydemo
{
    /// <summary>
    /// Service1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {
        private string rootDir;
        public Authentication header;
        public Service1()
        {
            rootDir = Server.MapPath("/test");//服务器端路径映射 ，在IIS中定义一个虚拟路径/test，指向硬盘上的特定目录
        }
        [WebMethod(Description = "Need Authentication!")]
        [System.Web.Services.Protocols.SoapHeader("header")]
        public string GetFile(string filePath)
        {
            if (header.ValidateUser(header.UserName, header.PassWord) ||
                header.ValidateAdmin(header.UserName, header.PassWord))
            {
                FileStream myFile = File.OpenRead(rootDir + '' + filePath);
                BinaryReader br = new BinaryReader(myFile);
                byte[] btbuf = new byte[myFile.Length];
                for (int i = 0; i < myFile.Length; i++)
                {
                    btbuf[i] = br.ReadByte();
                }
                return Convert.ToBase64String(btbuf);
            }
            else
            {
                return "";
            }
        }
        [WebMethod(Description = "Need Authentication!")]
        [System.Web.Services.Protocols.SoapHeader("header")]
        public string ChangePassword(string newPass)//修改密码
        {
            string user="";
            if (header.ValidateUser(header.UserName, header.PassWord) ||
                header.ValidateAdmin(header.UserName, header.PassWord))
            {
                user = header.UserName;
            }
            else
            {
                return "没有找到该用户或密码错误";
            }
            if (header.ChangePassWord(user, newPass))
            {
                return "修改成功";
            }
            else
            {
                return "修改失败";
            }
        }
        [WebMethod(Description="Need Authentication!")]
        [System.Web.Services.Protocols.SoapHeader("header")]
        public string AddUser(string userName, string passWord, string auth)
        {
            if (header.ValidateAdmin(header.UserName, header.PassWord))
            {
                header.AddUser(userName, passWord, auth);
                return "添加成功！";
            }
            else
            {
                return "添加失败";
            }
        }
        [WebMethod]
        public string[] GetList()//获取目录列表
        {
            DirectoryInfo info = new DirectoryInfo(rootDir);
            string[] oc = new string[info.GetFiles().Length];
            int i = 0;
            foreach (FileInfo fileInfo in info.GetFiles())
            {
                oc[i] = fileInfo.Name;
                i++;
            }
            return oc;
        }
    }
}