从oracle中查出数据绑定到GridView,该如何解决

从oracle中查出数据绑定到GridView
我是这样做的：
OracleConnection mycnn = new OracleConnection("connectionString");
OracleDataAdapter oda = new OracleDataAdapter("select * from NEWGONGWENSP2_FC where FLOWCODE=" + FLOWCODE , mycnn);
  DataSet dataset = new DataSet();
  oda.Fill(dataset, "connectionString");
  //实现点击表头排序
  DataView view = dataset.Tables["connectionString"].DefaultView;
  string sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"];
  view.Sort = sort;
  GridView1.DataSource = view;
  GridView1.DataKeyNames = new String[] { "id" };
  GridView1.DataBind();

可报错：“从索引 0 处开始，初始化字符串的格式不符合规范。 ”
大家给看看搓出在那里？如果有跟好的办法请给小弟代码说明。

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哪一句报错
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OracleConnection mycnn = new OracleConnection("connectionString");

"connectionString" 改成 oracle的连接字符串。
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OracleConnection mycnn = new OracleConnection("connectionString");
=>
OracleConnection mycnn = new OracleConnection("Data Source=mapgisoaNET10;User ID=gt001;Password=gt001;");
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string strconn = ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;


这句话搞错对象了。。。

=>
ConfigurationManager.AppSettings["connectionString"]
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探讨

string strconn = ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;


这句话搞错对象了。。。

=>
ConfigurationManager.AppSettings["connectionString"]

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<--config-->
<add name="OracleConnectionString" connectionString="Password=sa;User ID=sa;Data Source=orcl_DB;Persist Security Info=True" providerName="System.Data.OracleClient"/>

<-页面->
string strConn= ConfigurationManager.AppSettings["OracleConnectionString"]
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SQL code

select * from newgongwensp2_fc where 标题 like'%21%' and PERSONNAME like'%张力学%' and flowcode='20124' order by OPINIONDATE