Teacher/Myinfo.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 Teacher_Myinfo : System.Web.UI.Page
{
    Alert alert = new Alert();
    data data = new data();
 
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DropDownList2.DataSource = data.GetDataReader("select * from  Xueyuan");
            DropDownList2.DataTextField = "Name";
            DropDownList2.DataValueField = "id";
            DropDownList2.DataBind();
            DropDownList3.DataSource = data.GetDataReader("select * from  zhuanye");
            DropDownList3.DataTextField = "name";
            DropDownList3.DataValueField = "id";
            DropDownList3.DataBind();

            GetInfo();
        }
    }


    private void GetInfo()
    {

        SqlDataReader dr;
        dr = data.GetDataReader("select * from  Teacher where UserName='" + Session["UserName"] + "'");
        dr.Read();
        txtname.Text = dr["UserName"].ToString();

        txtemal.Text = dr["emal"].ToString();
        txtds.Text = dr["Ds"].ToString();
        DropDownList1.Items.FindByText(dr["Sex"].ToString()).Selected = true;

        DropDownList3.Items.FindByValue(dr["zhuanyeId"].ToString()).Selected = true;
        DropDownList3.Items.FindByText(dr["ZhuanyeName"].ToString()).Selected = true;
        DropDownList2.Items.FindByValue(dr["xueyuanId"].ToString()).Selected = true;
        DropDownList2.Items.FindByText(dr["XueyuanName"].ToString()).Selected = true;



        txtxuehao.Text = dr["xuehao"].ToString();
        txttime1.Value = dr["chushengriqi"].ToString();


    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {