dropdownlist.aspx.cs

ASP.net+Access数据库源码数据库源码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.OleDb;

public partial class DropDownlist : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            OleDbConnection con = DB.creatConnection();
            con.Open();
            OleDbCommand cmd = new OleDbCommand("select * from bmTable1", con);
            OleDbDataReader sdr = cmd.ExecuteReader();
            this.ddgongsi.DataSource = sdr;
            this.ddgongsi.DataTextField = "bmName";
            this.ddgongsi.DataValueField = "bmID";
            this.ddgongsi.DataBind();
            sdr.Close();

            OleDbCommand cmm = new OleDbCommand("select bsID,bsName from bmTable1 where bmID = '"+ddgongsi.Text.ToString().Trim()+"'",con);
            OleDbDataReader sddr = cmm.ExecuteReader();
            this.ddbumen.DataSource = sddr;
            this.ddbumen.DataTextField = "bsName";
            this.ddbumen.DataValueField = "bsID";
            this.ddbumen.DataBind();
            sddr.Close();
            con.Close();
        } 
    }
    protected void ddgongsi_SelectedIndexChanged(object sender, EventArgs e)
    {
        OleDbConnection con = DB.creatConnection();
        con.Open();
        OleDbCommand cmm = new OleDbCommand("select bsID,bsName from bmTable1 where bmID = '" + ddgongsi.Text.ToString().Trim() + "'", con);
        OleDbDataReader sddr = cmm.ExecuteReader();
        this.ddbumen.DataSource = sddr;
        this.ddbumen.DataTextField = "bsName";
        this.ddbumen.DataValueField = "bsID";
        this.ddbumen.DataBind();
        sddr.Close();
        con.Close();
    }
    protected void ddbumen_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string ddbumenid = ddbumen.SelectedValue.ToString().Trim();
        string ddgongsiid = ddgongsi.SelectedValue.ToString().Trim();
        Response.Redirect("mainpage.aspx");
    }
}