default.aspx.cs

这是asp.net^和Visual C++Sharp编写的串并口通讯的书籍 源代码

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 CrystalDecisions.CrystalReports.Engine;
using System.Data.SqlClient;
using System.Data.OleDb;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|db_schoolcomputer.mdb;");
            con.Open();
            string strSql = "select 商品名称 from tb_08";
            OleDbDataAdapter myAdapter = new OleDbDataAdapter(strSql, con);
            DataSet ds = new DataSet();
            myAdapter.Fill(ds, "tb_08");
            DropDownList1.DataSource = ds;
            DropDownList1.DataTextField = "商品名称";
            DropDownList1.DataBind();
        }

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|db_schoolcomputer.mdb;");
        con.Open();
        string strSql = "select * from tb_08 where 商品名称='"+DropDownList1.SelectedValue.ToString()+"'";
        OleDbDataAdapter myAdapter = new OleDbDataAdapter(strSql, con);
        DataSet ds = new DataSet();
        myAdapter.Fill(ds, "tb_08");
        ReportDocument studentsReport = new ReportDocument();//定义ReportDocument类对象
        studentsReport.Load(Server.MapPath("CrystalReport.rpt"));//加载报表
        studentsReport.SetDataSource(ds);//加载数据源
        this.CrystalReportViewer1.ReportSource = studentsReport;//为CrystalReportViewer控件指定报表
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}