注册、登录、找回/register.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Car
{
    public partial class register : Form
    {
        public register()
        {
            InitializeComponent();
        }
        protected override CreateParams CreateParams  //防止界面闪烁
        {
            get
            {
                CreateParams paras = base.CreateParams;
                paras.ExStyle |= 0x02000000;
                return paras;
            }
        }
        private void register_Load(object sender, EventArgs e)
        {
            this.BackColor = Color.FromArgb(81, 81, 81);
            this.cmb_dept.Items.Add("管理部");
            this.cmb_dept.Items.Add("销售部");
          
        }

        private void btn_cancel_Click(object sender, EventArgs e)
        {
            this.Close();
            
        }

        private void label4_Click(object sender, EventArgs e)
        {
            user_insert insert = new user_insert();
            insert.ShowDialog();
        }

        private void btn_register_Click(object sender, EventArgs e)
        {

            string admins = text_admins.Text;
            string password = text_password.Text;
            string dept = cmb_dept.Text;
            if (string.IsNullOrEmpty(admins) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(dept))
            {

                MessageBox.Show("请输入用户名、密码、部门", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            string sql = string.Format("select * from v_user_dept where user_admin='{0}'and user_pwd='{1}'and dept_name='{2}'", admins, password, dept);