转载from：http://www.cnblogs.com/gguozhenqian/p/4262813.html

操作步骤：

1. DLL下载后并引用
   下载地址：Oracle.ManagedDataAccess.zip
   下载后，将Oracle.ManagedDataAccess.dll放到自己的项目中，然后引用
   
   
2. 直接调用（connString 改为自己的连接字符串）

   using Oracle.ManagedDataAccess.Client;
    
   public static string ConnectOracle()
           {
               try
               {
                   string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=130.147.246.144)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ECMS)));Persist Security Info=True;User ID=system;Password=Service01;";
                   OracleConnection con = new OracleConnection(connString);
                   
                   con.Open();
                   return string.Empty;
               }
               catch (Exception ex)
               {
                   return ex.ToString();
               }
           }

    

3. 传参查询

   string sql="select * from table1 where Code=:code";
   string code=TextBox1.Text;
   
   string connstring ="你的connString(如第二点)";
   OracleConnection conn = new OracleConnection(connstring);
   conn.Open();
   OracleCommand cmd = new OracleCommand(sql,conn);
   cmd.Parameters.Add(new OracleParameter(":code",code));
   OracleDataAdapter oradap = new OracleDataAdapter(cmd);
   DataSet ds = new DataSet();
   oradap.Fill(ds);
   DataTable tb = ds.Tables[0];
   ASPxGridView1.DataSource = tb;
   ASPxGridView1.DataBind();
   //ASPxGridView 是DEV控件，也可绑定GridView