students/Manage.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class students_Manage : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            (Master.FindControl("Label1") as Label).Text = "管理学生";
            btnDelete.Attributes.Add("onclick", "return confirm(\"你确认要删除吗？\")");
            DataSet ds = SqlHelper.ExecuteforDataSet("select cid,cname from classes");
            ddlcid.DataSource = ds;
            ddlcid.DataTextField = "cname";
            ddlcid.DataValueField = "cid";
            ddlcid.DataBind();
            ddlcid.Items.Insert(0, new ListItem("---全部---", ""));

            BindData();
        }
    }

    // 绑定
    private void BindData()
    {
        string where = " where 1=1 ";

        if (txt_sno.Text != "")
        {
            where += " and sno like '%" + txt_sno.Text + "%' ";
        }

        if (txt_lname.Text != "")
        {
            where += " and lname like '%" + txt_lname.Text + "%' ";
        }

        if (txt_sname.Text != "")
        {
            where += " and sname like '%" + txt_sname.Text + "%' ";
        }

        if (ddlcid.SelectedValue != "")
        {
            where += " and a.cid=" + ddlcid.SelectedValue + "";
        }



        GridView1.DataSource = SqlHelper.ExecuteforDataSet("select a.*,b.cname,c.tname from students a left join classes b on a.cid=b.cid left join teachers c on a.tid=c.tid " + where + " order by sno desc");
        GridView1.DataBind();