Sử dụng class System.Data.OracleClient
Oracle_ConnectString để trong file . config
nếu là web thì là web.config, nếu là app thì là app.config hoặc app.exe.config
<?xml version="1.0" encoding="utf-8" ?><configuration><appSettings><add key="Oracle_ConnectString" value="Data Source=dbtest;User ID=haitest;Password=hahaha;"/></appSettings></configuration>using System.Data.OracleClient;private void btnTestConnect_Click(object sender, EventArgs e){ try { string connectionString = ConfigurationSettings.AppSettings["Oracle_ConnectString"]; OracleConnection myConnection = new OracleConnection(connectionString); myConnection.Open(); MessageBox.Show("Connected Sucessfully!","Connection Information"); } catch (Exception ex) { MessageBox.Show(ex.Message,"Connection error"); } }