SysManage/ChangePwd.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class ChangePwd : System.Web.UI.Page  
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["RoleName"] == null)
        {
            Response.Redirect("Login.aspx");
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string pwd_old = txt_old_pwd.Text.Trim();
        string pwd_new = txt_new_pwd.Text.Trim();
        string roleName = Session["RoleName"].ToString();
        string userName=Session["UserName"].ToString();
        string sql = "";
        if (roleName == "管理员")
        {
            sql = "select * from Admins where UserName='" + userName + "' and UserPwd='" + pwd_old + "'";
        }
        else if (roleName == "学生")
        {
            sql = "select * from Users where UserName='" + userName + "' and UserPassword='" + pwd_old + "'";
        }
        else if (roleName == "辅导员")
        {
            sql = "select * from Instructors where UserName='" + userName + "' and UserPassword='" + pwd_old + "'";
        }
        else
        {
            sql = "select * from Teachers where UserName='" + userName + "' and UserPassword='" + pwd_old + "'";
        }
        bool bl = DB.isExists(sql);
        if (bl)
        {
            if (roleName == "管理员")
            {
                sql = "update Admins set UserPwd='" + pwd_new + "' where UserName='" + userName + "'";
            }
            else if (roleName == "学生")
            {
                sql = "update Users set UserPassword='" + pwd_new + "' where UserName='" + userName + "'";
            }
            else if (roleName == "辅导员")
            {
                sql = "update Instructors set UserPassword='" + pwd_new + "' where UserName='" + userName + "'";
            }
            else
            {