c# - Connecting to oracle Database wouldn't work -


i want connect oracle database visual studio , populate datagridview data. know oracle . have sid,username , password. code:

  using oracle.dataaccess.client;   private void form1_load(object sender, eventargs e)     {         var select = "select * tblproject";          conn.connectionstring = "data source=(description="          + "(address_list=(address=(protocol=tcp)(host=10.3.50.205)(port=1521)))"          + "(connect_data=(server=dedicated)(sid=sid)));"          + "user id=username;password=pass;";      }     using (oracleconnection connection = new oracleconnection(conn.connectionstring))         {             oracledataadapter adapter = new oracledataadapter(select, connection);              try             {                 connection.open();                                     var ds = new dataset();                 adapter.fill(ds);                 datagridview1.readonly = true;                 datagridview1.datasource = ds.tables[0];             }             catch (exception ex)             {                 console.writeline(ex.message);             }           }

but connection wouldn't open? problem? thank you

there several dataconnectors on market. @ least microsoft, oracle , devart. connection strings not compatible. have pay attention when looking examples.

i use ezconnect whenever possible:

username/password@[//]host[:port][/service_name]

less type -> less errors. once had connect test system refused old syntax, accepted ezconnect. never figured out why.


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