using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;namespace ado.netDemo
{class Program{static void Main(string[] args){//定义连接字符串string connStr = @"server=SUNNY\SQLEXPRESS;database=TestDB;UID=sa;PWD=123456";//连接数据库SqlConnection conn = new SqlConnection(connStr);//SQL语句string sql = "select * from tb_Students";//string sql = "insert into tb_Students(SID, Name, Password, Sex, Age, Address, Phone, QQ) Values('20117750120','小鸟电动车','123','男',21,'HONGKONG','18736000000','1147016165')";//string sql = "update tb_Students set SID='20117750119' where SID='20117750120'";//string sql = "delete from tb_Students where SID='20117750101'";//执行SQL语句SqlCommand cmd = new SqlCommand(sql,conn);conn.Open();SqlDataReader reader = cmd.ExecuteReader();while (reader.Read())//read（）一直读取下一个数据
            {Console.WriteLine(string.Format("{0}\t{1}\t{2}\t{3}", reader[0],reader[1], reader[2], reader[3]));}reader.Close();//查询数据#region//ExecuteScalar执行sql查询语句的第一行第一列，忽略其他行其他列。//object result = cmd.ExecuteScalar();//Console.WriteLine("共查询到有：{0}行数据", result.ToString());#endregion//增加数据#region//int result = cmd.ExecuteNonQuery();//if (result < 1)//{//    Console.WriteLine("数据插入失败，请检查填写信息，重新操作");//}//else//{//    Console.WriteLine("数据插入成功！");//}#endregion//修改数据#region//int result = cmd.ExecuteNonQuery();//if (result < 1)//{//    Console.WriteLine("数据修改失败，请检查填写信息，重新操作");//}//else//{//    Console.WriteLine("数据修改成功！");//}#endregion//删除数据#region//int result = cmd.ExecuteNonQuery();//if (result < 1)//{//    Console.WriteLine("数据删除失败，请检查填写信息，重新操作");//    Console.WriteLine("{0}行收到影响", result);//}//else//{//    Console.WriteLine("数据删除成功！");//    Console.WriteLine("{0}行收到影响", result);//}#endregionconn.Close();Console.ReadKey();}}
}

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 using System.Data.SqlClient;
 8 using System.Configuration;
 9 using System.Data;
10
11 namespace ado.netDemo1
12 {
13     public partial class Test1 : System.Web.UI.Page
14     {
15         protected void Page_Load(object sender, EventArgs e)
16         {
17             //string connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
18             //SqlConnection conn = new SqlConnection(connStr);
19             //conn.Open();
20             //string sql = "select * from tb_Students";
21             //SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
22             //DataSet dataset = new DataSet();
23             //adapter.Fill(dataset);
24             //conn.Close();
25             //GridView1.DataSource = dataset.Tables[0].ToString();
26             //GridView1.DataBind();
27
28
29             GridView1.DataSource = getResult();
30             this.GridView1.DataBind();
31         }
32
33         //将数据库信息田中到DataSet的DataTable中
34         public DataSet getResult()
35         {
36             string connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
37             SqlConnection conn = new SqlConnection(connStr);
38             conn.Open();
39             string sql = "select * from tb_Students";
40             //创建数据适配器
41             SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
42             //创建数据集对象
43             DataSet dataset = new DataSet();
44             //使用适配器对象Fill()方法填充DataSet数据集
45             adapter.Fill(dataset);
46             conn.Close();
47             return dataset;
48         }
49     }
50 }