App_Code/database.cs

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

/// <summary>
/// database 的摘要说明
/// </summary>
public class databaseAccess
{
    private static string connection = ConfigurationManager.ConnectionStrings["shopConnectionString"].ToString();
	public databaseAccess()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    public static bool checkUserExist(string name)
    {
        SqlConnection con = new SqlConnection(connection);
        SqlCommand com = new SqlCommand("select password from shopper where shopperID  ='" + name + "'",con);
        con.Open();
        try
        {
            com.ExecuteNonQuery();
            return true;
        }
        catch
        {
            return false;
        }
        finally
        {
            con.Close();
        }
    }
    public static SqlDataReader Message(string key)
    {
        SqlConnection con = new SqlConnection(connection);
        SqlCommand com = new SqlCommand("select city from place where province = '" + key + "'", con);
        con.Open();
        try
        {
            return com.ExecuteReader(CommandBehavior.CloseConnection);
        }
        catch
        {
            return null;
        }
    }

    public static int GetcartID()
    {
        SqlConnection con = new SqlConnection(connection);