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public DataSet ConnectDB(string cmmStr)
        {
            string connStr= "Provider=Microsoft.Jet.OLEDB.4.0;DataSource~/App_Data\\ThreeLayer.mdb";
         
            OleDbConnection conn = new OleDbConnection(connStr);

            OleDbDataAdapter odc = new OleDbDataAdapter(cmmStr,conn);
            DataSet ds = new DataSet();
            odc.Fill(ds);
            try
            {
                conn.Open();
                return ds;
            }
            catch (OleDbException oe)
            {
                conn.Close();
            }

        }
return ds.Tables(0)

conn.Open(); Òª·ÅÔÚÇ°Ãæ

            try
            {
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