工程范例

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类库文件（DBoper.cs）：

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace DBManage
{
    public class DBoper
    {
        public static DataSet getCustomers(string ContactTitle, string Conn)
        {
            string str = "select * from Customers where ContactTitle=@ContactTitle";
            SqlConnection sqlConn = new SqlConnection(Conn);
            sqlConn.Open();
            SqlCommand sqlCmd = new SqlCommand(str, sqlConn);
            SqlParameter ConTitle = new SqlParameter("@ContactTitle",SqlDbType.NVarChar,20);
            ConTitle.Value = ContactTitle;
            sqlCmd.Parameters.Add(ConTitle);
            SqlDataAdapter sqlAdpor = new SqlDataAdapter(sqlCmd);
            DataSet ds = new DataSet();
            sqlAdpor.Fill(ds,"Customers");
            sqlConn.Close();
            return ds;

}
}
}

首页文件(（Default.aspx)：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="test.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

后台文件（Default.aspx,cs)：

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 DBManage;
using System.Configuration;

namespace test
{

    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 contitle;
            string Conn = ConfigurationManager.AppSettings["sqlConnectionString"];
            contitle = TextBox1.Text;
            GridView1.DataSource= DBoper.getCustomers(contitle, Conn);
            GridView1.DataBind();
        }
    }
}

过程：先编写类库，然后将其编译，生成dll文件，并在网页工程中添加引用，最后在工程中调用