让我烦恼的错误提示

F:\www.lemongtree.com\bll\BLL\admin.cs(21): “LemongTree.BLL.Admin.admin.dbLayerddddddd”表示“字段”，此处应为“类”

using System;
using System.Data;
using LemongTree.DbLayer;
namespace LemongTree.BLL.Admin
{
    /// <summary>
    /// admin 的摘要说明。
    /// </summary>
    public class admin
    {
        private LemongTree.DbLayer.DbAccess dbLayerddddddd = new DbAccess(false);
        public admin()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        public static DataTable sourceList()
        {
            string sql = "select * from [location] order by id desc";
            return dbLayerddddddd.ExectueDataTable(sql,"tbllocation");    //这里出错
        }
    }
}

db也只是一个简单的数据访问类
ExecuteDataTable方法

/// <summary>
        /// 返回一个DataTable
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="tableName">表名</param>
        /// <returns></returns>
        public DataTable ExectueDataTable(string sql,string tableName)
        {
            OleDbDataAdapter da = new OleDbDataAdapter(sql,this._conn);
            DataSet dst = new DataSet();
            da.Fill(dst,tableName);
            return dst.Tables[tableName];
        }

不管怎么生成都出错，是什么原因？？