c# - Database connection by connection string returns null -

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i try connection between database using connection string , in app.config. problem variable adapter returns null , desired data not read. find no error in code .

datatable ds;  string con = system.configuration.configurationmanager.connectionstrings["dbconnect"].connectionstring; using (sqlconnection conn = new sqlconnection(con)) {     sqldataadapter adapter;     adapter = new sqldataadapter("select a.aaa, m.bbb, m.ccc m.ddd lst_mdmel_lis_tab m (nolock) inner join lst_absae_tab (nolock) on a.id = m.id m.bbb >= 30 , m.fff= 35 order a.aaa", conn);      ds = new datatable(" ");     adapter.fill(ds);     datagridview1.datasource = ds;  } 

where m.bbb>= '30' , m.fff= '35'

>= comparison operator numerical values. therefore, if m.bbb numerical value along m.fff correct syntax be

where m.bbb >= 30 , m.fff= 35

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