Admin/Login.aspx.cs

微信扫码关注公众号，代码整理好后第一时间通知你。

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 Admin_Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

        }
    }
   
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        try
        {
            SqlConnection con = new SqlConnection(SqlHelper.connstring);
            con.Open();
            string roleName = DropDownList1.SelectedItem.Text.Trim();
            string sql = "";
            if (roleName == "教师")
            {
                sql = "select * from Teachers where  UserName='" + this.txtname.Value + "'and  UserPassword='" + this.txtpwd.Value + "'";
            }
            if (roleName == "管理员")
            {
                sql = "select * from Admin where  UserName='" + this.txtname.Value + "'and  UserPassword='" + this.txtpwd.Value + "'";
            }
            SqlCommand cmd = new SqlCommand(sql, con);
            SqlDataReader sdr = cmd.ExecuteReader();
            if (sdr.Read())
            {
                Session["AdminName"] = sdr["UserName"].ToString();
                Session["AdminId"] = sdr["id"].ToString();
                Session["RoleName"] = roleName;
                Response.Redirect("MainFrame.aspx");
            }
            else
            {
                Response.Write("<script language='javascript'>alert('用户名或密码错误请重新登录！');location.href='login.aspx'</script>");
            }

        }
        catch (Exception )
        {
            Response.Write("<script language='javascript'>alert('登录失败，请重试！');location.href='login.aspx'</script>");
        }
    }
}