App_Code文件夹中对数据库的操作该如何写代码(asp.net+sql 2000+c#)

其实就是写一个连接类，然后调用就可以了；
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Data.SqlClient;
using System.IO;

///

/// DBConnection 的摘要说明
///

public class DBconnection
{
SqlConnection conn = null;
SqlCommand cmd = new SqlCommand();

public DBconnection()
{
conn = new SqlConnection("server=.;database=university_db;uid=sa;pwd=123;");
}
public SqlConnection getconn()
{
if (conn.State == ConnectionState.Closed)

conn.Open();//打开连接
return conn;
}
//关闭连接
public void clear()
{
if (conn.State == ConnectionState.Open)
conn.Close();
}
}
然后在你要用连接的页面的.cs页面调用就可以了呀

上面的问题就是你的答案，太巧了

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
string s = System.Configuration.ConfigurationManager.ConnectionStrings["loginConnectionString"].ToString();

SqlConnection con = new SqlConnection(s);

con.Open();

string name = this.TextBox1.Text.Trim();

string pwd = this.TextBox2.Text.Trim();

string sql = "insert into denglu(name,pwd)values('"+name+"','"+pwd+"')";

SqlCommand cmd = new SqlCommand(sql,con);

cmd.ExecuteNonQuery();

Response.Write("");

从问题可以看出你是刚入门的
花些时间看入门教程去