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 Login : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnLogin_ServerClick(object sender, EventArgs e)
    {
        if (DropDownList1.SelectedValue == "管理员")
        {
            if (TxtUserName.Value == "" && TxtPassword.Value == "")
            {
                Alert.AlertAndRedirect("没有输入账号和密码！", "Login.aspx");


            }
            else
            {
                SqlDataReader dr;
                dr = data.GetDataReader("select * from  Admin where Name='" + TxtUserName.Value.Trim() + "'and pwd='" + TxtPassword.Value.Trim() + "'");
                if (dr.Read())
                {
                    Session["UserName"] = dr["Name"].ToString();
                    Session["UserId"] = dr["id"].ToString();
                    Response.Redirect("Admin/index.htm");
                }
                else
                {
                    Alert.AlertAndRedirect("账号或者密码不对请重新登陆！", "Login.aspx");
                }
            }

        }
        if (DropDownList1.SelectedValue == "老人")
        {
            if (TxtUserName.Value == "" && TxtPassword.Value == "")
            {
                Alert.AlertAndRedirect("没有输入账号和密码！", "Login.aspx");


            }
            else
            {
                SqlDataReader dr;
                dr = data.GetDataReader("select * from  OldPeople where UserNubmer='" + TxtUserName.Value.Trim() + "'and pwd='" + TxtPassword.Value.Trim() + "'");
                if (dr.Read())
                {
                    Session["UserName"] = dr["UserTrueName"].ToString();