C#连接数据库（ADO.NET）

   string ConnectionString = "Data Source=127.0.0.1/orcl;user id=scott;password=tiger;";
            OracleConnection conn = new OracleConnection(ConnectionString);
            try
            {
                conn.Open();
                OracleCommand cmd = conn.CreateCommand();
                if (conn.State == ConnectionState.Open)
                {
                    textBox1.Text = "连接成功";
                }

            }
            catch (Exception ee)
            {
                System.Diagnostics.Debug.WriteLine(ee.Message); 
            }
            finally
            {
                conn.Close(); 
            }

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//引用oracle存储位置命名空间
using System.Data.OracleClient;
namespace demo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string ConnectionString = "Data Source=127.0.0.1/orcl;user id=scott;password=tiger;";
            OracleConnection conn = new OracleConnection(ConnectionString);
            try
            {
                conn.Open();
                OracleCommand cmd = conn.CreateCommand();
                if (conn.State == ConnectionState.Open)
                {
                    textBox1.Text = "连接成功";
                }

            }
            catch (Exception ee)
            {
                System.Diagnostics.Debug.WriteLine(ee.Message);
            }
            finally
            {
                conn.Close();
            }

        }
    }
}