I_Left.ascx.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;

public partial class I_Left : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.initForm();
        }
    }

    protected void btnLogin_Click(object sender, EventArgs e)
    {
        StudentMgr mgr = new StudentMgr();
        Student student = mgr.GetStudent(this.txtStudentID.Text);
        if (this.txtStudentID.Text.Trim() == "")
        {
            WebPage webPage = (WebPage)this.Page;
            webPage.SendMessage("用户名不能为空");
            return;
        }
        else if (this.txtPassword.Text == "")
        {
            WebPage webPage = (WebPage)this.Page;
            webPage.SendMessage("用户密码不能为空");
            return;
        }

        if (student != null && student.StudentID.ToString() != "")
        {
            if (student.Password == this.txtPassword.Text)
            {
                this.Page.Session["eStudentID"] = student.StudentID;
                this.Page.Session["eStudentName"] = student.StudentName;
                Response.Redirect("Student_Main.aspx");
            }
            else
            {
                WebPage webPage = (WebPage)this.Page;
                webPage.SendMessage("登录密码不正确");
                return;
            }
        }
        else
        {
            WebPage webPage = (WebPage)this.Page;
            webPage.SendMessage("没有找到该用户");
            return;

        }