Login.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 DegnLu : System.Web.UI.Page
{

    SqlData data = new SqlData();
    SqlDataReader dr;
    Alert js = new Alert();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
 
    protected void Submit1_ServerClick(object sender, EventArgs e)
    {
        if (Session["CheckCode"].ToString() != userImg.Value)
        {
            Alert.AlertAndRedirect("验证码错误请重新输入", "Login.aspx");
        }
        else
        {
            if (DropDownList1.SelectedValue == "管理员")
            {

                string userName = this.TextBox1.Value;
                string Pwd = this.passWord.Value;


                string sql = "select * from Admin where Name='" + userName + "' and Pwd='" + Pwd + "'";
                SqlDataReader dr = data.GetDataReader(sql);
                if (dr.Read())
                {
                    Session["Admin"] = dr["Name"].ToString();
                    Session["adminid"] = dr["id"].ToString();

                    Response.Write("<script language='javascript'>location.href='Admin/index.html'</script>");


                }
                else
                {
                    Alert.AlertAndRedirect("登录失败", "Login.aspx");

                }
            } if (DropDownList1.SelectedValue == "员工")
            {

                string userName = this.TextBox1.Value;
                string Pwd = this.passWord.Value;