我把More.listen的文件设置成起始页的时候一运行出现下面的错误

这个文件的代码是using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
using System.Data.SqlClient;

/// <summary>
/// DBcon 的摘要说明
/// </summary>
public class DBcon
{
    /// <summary>
    /// DBcon 的摘要说明。
    /// </summary>

        AccessBase Acc = new AccessBase();
   // private static string db = ConfigurationSettings.AppSettings["conStr"];
        public DBcon()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
  // 
        
        public static DataSet ExecutSelectsql(string sqlselect)
        {
            SqlConnection conn = DBManager.createConnection();
           // SqlConnection conn = new SqlConnection(db);
            SqlDataAdapter sda = new SqlDataAdapter(sqlselect, conn);
            DataSet ds = new DataSet();
            try
            {
                sda.Fill(ds);
            }
            catch (SqlException e)
            {
                throw new Exception(e.Message);
            }
            return ds;
        }
        public static int Excutsql(string sql)
        {
            int row = -1;
            SqlConnection conn = DBManager.createConnection();
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                row = cmd.ExecuteNonQuery();
            }
            catch (SqlException e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
            }
            return row;
        }
        public static string Excutsql1(string sql)
        {
            string row = "";
            SqlConnection conn = DBManager.createConnection();
            SqlCommand cmd = new SqlCommand(sql, conn);
            try
            {
                conn.Open();
                row = cmd.ExecuteScalar().ToString();
            }
            catch (SqlException e)
            {
                throw new Exception(e.Message);
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
            }
            return row;
        }
   
}
我该怎么改，哪个等号附近的语法错误了啊？我是新手告诉的详细一点具体怎么改都用代码写出来告诉我一下谢谢了 我在线等要是代码不够或者别的什么问题我会立刻的在发上来