C#链接数据库基础语法

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;//添加引用

namespace WinFromConnSQLDemo1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=.;database=medexinfoLH;uid=sa;pwd=MedExSQLServerAdmin;");
            SqlCommand comm = new SqlCommand("select doctortitle from doctor", conn);
            SqlDataReader dr = null;
            try
            {
                conn.Open();
                dr=comm.ExecuteReader();//读取数据使用这个，增删改用ExecuteNonQuery()方法
                if (dr.HasRows)//如果有数据
                {
                    listBox1.Items.Clear();//先清空;
                    while (dr.Read())
                    {
                        //string result=dr.GetString(0);//dr["doctortitle"].ToString();//dr[0].ToString();
                        //listBox1.Items.Add(result);
                        listBox1.Items.Add(dr.GetString(0));
                    }
                }
            }
            catch (SqlException ex)
            {

                MessageBox.Show(ex.ToString());
            }
            finally
            {
                dr.Close();
                conn.Close();
            }
        }
    }
}