c#链接数据库

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 数据库连接
{
    class Program
    {
        static void Main(string[] args)
        {
            //连接数据库
            SqlConnection conn = new SqlConnection("server=.;database=cangkudata;user=sa;pwd=1243672715");
            SqlCommand cmd = conn.CreateCommand();//创建数据库操作对象
            cmd.CommandText = "select * from cangku ";//指令

            conn.Open();//打开数据库连接
            SqlDataReader dr = cmd.ExecuteReader();//返回一个dr结果值

            if (dr.HasRows)//判断是否含有数据，返回true or false
            {
                while (dr.Read())//指针下移
                {
                    Console.Write(dr[].ToString() + "   " + dr[].ToString() + "\n");
                }
            }

            conn.Close();

            Console.ReadKey();
        }
    }
}