个人网页/Register.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using System.Drawing;
using System.Web.Security;


namespace 个人网页
{
    public partial class Register1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                tbUserName.Attributes["onkeyup"] = "value=value.replace(/[^\\w+$]/g,'')";
            }
        }
        protected bool isName(string username)
        {
            string sqlstr = "select count(*) from Users where UserName = '" + username + "'";
            SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnStr"]);
            conn.Open();
            SqlCommand cmd = new SqlCommand(sqlstr, conn);
            if (Convert.ToInt32(cmd.ExecuteScalar()) > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        protected void button1_Click(object sender, EventArgs e)
        {
            if (isName(tbUserName.Text))
            {
                labIsName.Text = "用户名已存在！";
                labIsName.ForeColor = System.Drawing.Color.Red;
                Response.Write("请正确填写信息！");
           
            }
            else
            {
                string username;
                string MdPswdStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tbPassword.Text, "MD5");
                username = tbUserName.Text;
                string password = MdPswdStr;
                string useremail = tbEmail.Text;
                string sex = "";
                if (radlistSex.SelectedValue.Trim() == "男")
                {
                    sex = "男";
                }