连接dbf 提示不能打开文件.dbc

在C#代码中连接Weight.dbf时提示信息不能打开文件scale.dbc，是怎么原因?
我是单把那边的数据库文件Weight.dbf拷贝到本机上调试的
代码如下：
DataSet ReadSJSHQ()
        {
            //string strConn = @"Provider=vfpoledb;Data Source=D:\Pfrmis\Data\database;Collating Sequence=machine;";            //using (OleDbConnection myConnection = new OleDbConnection(strConn))
            //{
            //    myConnection.Open();
            //    OleDbDataAdapter adpt = new OleDbDataAdapter("select * from Weight.dbf", myConnection);
            //    DataSet mySet = new DataSet();
            //    adpt.Fill(mySet);
            //    myConnection.Close();
            //    return mySet;
            //}            System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection();
            string tb = @"D:\Pfrmis\Data\database\Weight.dbf";
            //string connStr = @"Driver={Microsoft Visual FoxPro Driver};SourceType=DBF;SourceDB=" + tb + ";Exclusive=No;NULL=NO;Collate=Machine;BACKGROUNDFETCH=NO;DELETED=NO";
            string connStr = @"Dsn=Visual FoxPro Tables;sourcedb=D:\Pfrmis\Data\database;sourcetype=DBF;exclusive=No;backgroundfetch=Yes;collate=Machine";
            //string connStr = @"Driver={Microsoft Visual FoxPro Driver};SourceType=DBF;SourceDB=D:\Pfrmis\Data\database;Exclusive=No;BackgroundFetch=No;"; 
            conn.ConnectionString = connStr;
            conn.Open();
            string sql = "select * from " + tb;
            OdbcDataAdapter da = new OdbcDataAdapter(sql, conn);
            DataSet ds = new DataSet();
            da.Fill(ds);
            conn.Close();
            return ds;
        }