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  private static bool readTyreParaXml()
        {
            bool res = true;
            dt = null;
            try
            {
                string[] keys = new string[1];
                keys[0] = "ID";
                dt = tyrePara.readXMLToDataTable(keys);
            }
            catch
            {
                res = false;
            }
            return res;
        }
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string filter = ²éѯÓï¾ä£»

                DataRow[] dr = dt.Select(filter);
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string filter = "outDiameter <= " + outDiameterMax + " and outDiameter >= " + outDiameterMin


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VB.NET code:

Public Function RecordSetBySql(ByVal Sql As String) As XmlDataDocument
Dim xRs As ADODB.Recordset
Dim cmd As ADODB.Command
......

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