admin/ModifyStudent.aspx.cs

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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.SqlClient;
public partial class ModifyStudent : System.Web.UI.Page
{
    Alert alert = new Alert();
    data data = new data();
    data mydata = new data();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DropDownList2.DataSource = mydata.GetDataReader("select * from  YuanXi");
            DropDownList2.DataTextField = "Name";
            DropDownList2.DataValueField = "id";
            DropDownList2.DataBind();
            DropDownList3.DataSource = mydata.GetDataReader("select * from  banJi where YuanXiid='" + DropDownList2.SelectedValue + "'");
            DropDownList3.DataTextField = "name";
            DropDownList3.DataValueField = "id";
            DropDownList3.DataBind();

         
            Get_Data();
        }
    }
    private void Get_Data()
    {
        int id = int.Parse(Request.QueryString["id"].ToString());
        SqlDataReader dr;
        dr = data.GetDataReader("select * from  Student where id=" + id);
        dr.Read();
        txtname.Text = dr["UserName"].ToString();
      
        txtemal.Text= dr["emal"].ToString();
        txtds.Text = dr["Ds"].ToString();
        DropDownList1.Items[0].Text = dr["Sex"].ToString();

    
        try
        {
            DropDownList3.Items[0].Text = dr["banJi"].ToString();
            //DropDownList3.Items.FindByText(dr["banJi"].ToString()).Selected = true;
        }
        catch
        {
        }
        try
        {
            DropDownList2.Items[0].Text = dr["YuanXi"].ToString();
            //DropDownList2.Items.FindByText(dr["YuanXi"].ToString()).Selected = true;
        }
        catch