错误 14 当前上下文中不存在名称“PubConstant”

Question

生成网站的时候 总是提示   QuestionList_bll 错误 14 当前上下文中不存在名称“PubConstant” 请各位老师帮忙看看代码有什么地方不对
ASPX.cs
using System;
using System.Collections;
using System.Configuration;
using System.Data;
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;
using BLL;
using Models;public partial class allerror : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bind();
        }
    }    private readonly QuestionList_bll bll = new QuestionList_bll();    int currPage = 1;
    int PageSize = 5;    public void Bind()
    {        int pageCount;
        int RecordCount;        Repeater1.DataSource = bll.GetPage(currPage, PageSize, out pageCount, out RecordCount);        Repeater1.DataBind();        this.AspNetPager1.RecordCount = RecordCount;        this.AspNetPager1.CurrentPageIndex = currPage;        this.AspNetPager1.PageSize = PageSize;    }
    protected void PageChanged(object sender, EventArgs e)
    {        int pageCount;
        int RecordCount;        Repeater1.DataSource = bll.GetPage(this.AspNetPager1.CurrentPageIndex, PageSize, out pageCount, out RecordCount);        Repeater1.DataBind();    }
    protected void btnSearch_Click(object sender, EventArgs e)
    {
        string keywords = this.txtSearch.Text;
        Response.Redirect("SearchQuestionList.html?keywords=" + keywords);
    }
    protected void btnAsk_Click(object sender, EventArgs e)
    {
        Response.Redirect("cuowu.html");
    }
}
QuestionList_bll文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using DLL;
using Models;namespace BLL
{
    public class QuestionList_bll
    {
        #region 调用全部的问题的列表的存储过程
        /// <summary>
        ///  调用procAllQuestionListSelect存储过程，得到全部的问题列表
        /// </summary>
        /// <returns></returns>
        public static DataSet GetAllQuestionList() 
        {
            SqlConnection con = DBHelper.Connection;
            SqlCommand cmd = new SqlCommand("procAllQuestionListSelect",con);
            cmd.CommandType = CommandType.StoredProcedure;            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            adp.Fill(ds);
            con.Close();
            return ds;
        }
        #endregion
        #region 调用未回答问题列表的存储过程
        /// <summary>
        ///  调用问题表中所有还未回答的问题的信息列表：包括字段：qid,ssname,qtitle,qip,qtime
        /// </summary>
        /// <returns></returns>
        public static DataSet GetNoReplyQuestionList()
        {
            SqlConnection con = DBHelper.Connection;
            SqlCommand cmd = new SqlCommand("procAllNoReplyQuestionListSelect", con);
            cmd.CommandType = CommandType.StoredProcedure;            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            adp.Fill(ds);
            con.Close();
            return ds;        }
        #endregion        #region 调用已回答的问题的部分信息列表的存储过程
        /// <summary>
        ///  调用已回答得的问题列表的存储过程
        /// </summary>
        /// <returns></returns>
        public static DataSet GetYesReplyQuestionList()
        {
            SqlConnection con = DBHelper.Connection;
            SqlCommand cmd = new SqlCommand("procAllYesReplyQuestionListSelect", con);
            cmd.CommandType = CommandType.StoredProcedure;            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            adp.Fill(ds);
            con.Close();
            return ds;
        }
        #endregion        #region 根据问题的编号得到ssid,返回该类的已回答的15条记录,供“您可能感兴趣的有”用
        /// <summary>
        /// 根据问题的编号得到ssid,返回该类的已回答的15条记录
        /// </summary>
        ///<param name="qid"></param>
        /// <returns></returns>
        public static DataSet GetTop15YesReplyQuestionListBySSid(int id)
        {
            SqlConnection con = DBHelper.Connection;
            DataSet ds = new DataSet();
            SqlDataAdapter da = new SqlDataAdapter("procTop15YesReplyQuestionListBySSidSelect", con);
            da.SelectCommand.CommandType = CommandType.StoredProcedure;
            SqlParameter para0 = new SqlParameter("@qid", id);
            da.SelectCommand.Parameters.Add(para0);
            da.SelectCommand.CommandType = CommandType.StoredProcedure;
            try
            {
                da.Fill(ds);
                con.Close();
                return ds;
            }
            catch (Exception ex)
            {
                con.Close();
                return null;
            }
            finally
            {
                con.Close();            }
        }
        #endregion
        #region 根据编号得到所有内容
        public IList<Question_model> GetPage(int pageindex, int _pageSize, out int pageCount, out int RecordCount)
        {            pageCount = 0;            RecordCount = 0;            IList<Question_model> list = new List<Question_model>();
            using (SqlConnection conn = new SqlConnection(PubConstant.ConnectionString))
            {                SqlCommand objcmd = new SqlCommand(".ThePagerIndex", conn);                objcmd.CommandType = CommandType.StoredProcedure;                SqlParameter[] para ={                  new SqlParameter("@strTable",SqlDbType.VarChar,-1),                 new SqlParameter("@strField",SqlDbType.VarChar,-1),                 new SqlParameter("@pageSize",SqlDbType.Int),                 new SqlParameter("@pageIndex",SqlDbType.Int),                 new SqlParameter("@strSortKey",SqlDbType.VarChar,-1),                 new SqlParameter("@strSortField",SqlDbType.VarChar,-1),                 new SqlParameter("@strOrderBy",SqlDbType.Bit),                 new SqlParameter("@pageCount",SqlDbType.Int),                 new SqlParameter("@RecordCount",SqlDbType.Int),                 new SqlParameter("@inttop",SqlDbType.Int,-1)             };                para[0].Value = "question";                para[1].Value = "*";                para[2].Value = _pageSize;                para[3].Value = pageindex;                para[4].Value = "qid";                para[5].Value = "qtime desc";                para[6].Value = 1;                para[7].Value = pageCount;                para[7].Direction = ParameterDirection.Output;                para[8].Value = RecordCount;                para[8].Direction = ParameterDirection.Output;                para[9].Value = -1;                objcmd.Parameters.AddRange(para);                conn.Open();                using (SqlDataReader reader = objcmd.ExecuteReader(CommandBehavior.CloseConnection))
                {                    while (reader.Read())
                    {                        Question_model model = new Question_model();                        model.Qid = Convert.ToInt32(reader["qid"]);                        model.Qtitle = Convert.ToString(reader["qtitle"]);                        list.Add(model);                    }                }                RecordCount = Convert.ToInt32(objcmd.Parameters["@RecordCount"].Value);                pageCount = Convert.ToInt32(objcmd.Parameters["@pageCount"].Value);                conn.Close();                conn.Dispose();            }            return list;        }        #endregion
    }
}

Answer 1

出错就是在 QuestionList_bll 文件using (SqlConnection conn = new SqlConnection(PubConstant.ConnectionString))
  红色部分

Answer 2

PubConstant自定义类库，添加引用
using 命名空间;

Answer 3

wuyq11   可否说明白一点？
初学 听不太懂

Answer 4

PubConstant
鼠标移到这个名字，看t右下角有出现个红色下划线不！有就移到那个下化线。引用命名空间！