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            OleDbConnection conn = new OleDbConnection(strConn);
            OleDbDataAdapter oada = new OleDbDataAdapter ( "select * from [" + sheetname + "$]", strConn );
            DataSet ds = new DataSet ();
            oada.Fill ( ds );
            return ds ;
        }
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public ArrayList ExcelSheetName ( string filepath )
...{
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    string strConn;
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