调用数据连接两种方法

1.web.config （配置文件） 中

<appSettings>

<add key="ConnectionString" value="serverlocalhost\sqlexpress;uid=sa;pwd=123456;database=News"/>

</appSettings>

调用的时候

string strConn = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString();

SqlConnection Conn = new SqlConnection(strConn);

2.或者不用web.config直接在文件中写

SqlConnection conn = new SqlConnection("server=.\\SQLEXPRESS;uid=sa;pwd=123456;database=login");

如何是Express版的数据库，一定要在服务器名的后面加上\\SSQLEXPRESS

一个完整的例子

string userName = Request.Form["userName"];

string userPwd = Request.Form["userPwd"];

SqlConnection con = new SqlConnection("server=localhost\\SqlExpress;uid=sa;pwd=123456;database=login");

con.Open();

SqlCommand cmd=new SqlCommand("select count(*) from login where userName='"+userName+"' and userPwd='"+userPwd+"'",con);

int count=Convert.ToInt32(cmd.ExecuteScalar());

if(count>0)

{

Response.Redirect("main.aspx");

}