Admin/Admin_AddUser.aspx.cs

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using System;
using System.Data;
using System.Data.OleDb;
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;

public partial class Admin_Admin_AddUser : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserID"] == "" || Session["UserID"] == null)
        {
            Response.Write("<script language=javascript>window.alert('为了系统安全，请您重新登陆');window.location.href=('Admin_Login.aspx')</script>");
        }
        if (!Page.IsPostBack)
        {
        }
    }
    public static bool findAdmin(string UserName)
    {
        OleDbConnection myconn = DB.CreateDB();
        myconn.Open();
        OleDbCommand cmd = new OleDbCommand("select count(*) from admin where admin='" + UserName + "'", myconn);
        int count = Convert.ToInt32(cmd.ExecuteScalar());
        if (count > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        string UserName = args.Value;
        if (findAdmin(UserName))
        {
            args.IsValid = false;
        }
        else
        {
            args.IsValid = true;
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.IsValid)
        {
            string admin = Request["UserName"].ToString();
            string pwd = Request["UserPwd"].ToString();
            OleDbConnection myconn = DB.CreateDB();
            myconn.Open();
            OleDbCommand cmd = new OleDbCommand("insert into admin(admin,pwd) values('" + admin + "','" + pwd + "')", myconn);