login.aspx.cs

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        string name = username.Value.ToString().Trim();
        string pwd = password.Value.ToString().Trim();
        string role = selectroal.SelectedValue.ToString().Trim();
        string sqlstr = "";
        switch (role)
        {
            case "tea":
                sqlstr = "select * from Teacher where Teaid='" + name + "'";
                break;
            case "stu":
                sqlstr = "select * from Student where Sno='" + name + "'";
                break;
            case "adm":
                sqlstr = "select * from admin where Name = '" + name + "'";
                break;
        }
        SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["web"]);
        SqlCommand com = new SqlCommand(sqlstr, conn);
        try
        {
            conn.Open();
            SqlDataReader sdr = com.ExecuteReader();
            if (sdr.Read())
            {
                if (sdr.GetString(2).ToString().Trim() == pwd)
                {
                    Session["Username"] = name;
                    Session["Userrole"] = role;
                    switch (role)
                    {
                        case "tea":
                            Response.Redirect("teacher.aspx");
                            break;
                        case "stu":
                            Response.Redirect("stuchoose.aspx");
                            break;
                        case "adm":
                            Response.Redirect("admin/adminMain.aspx");
                            break;
                    }
                }
                else
                {
                    Response.Write("<script language=javascript>alert('密码错误，请重新输入')</script>");
                }
            }
            else
            {
                Response.Write("<script language=javascript>alert('用户不存在或用户名错误')</script>");
            }
        }
        catch (Exception ee)
        {
            Response.Write("<script language=javascript>alert('" + ee.Message.ToString() + "')</script>");
        }
        finally
        {
            conn.Close();
        }
    }
}