Diplom/ChangePassword.cs

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

namespace ARM_spec_otdelenia
{
    public partial class ChangePassword : Form
    {
        public ChangePassword()
        {
            InitializeComponent();
        }
        public static bool IsValidEmail(string email)
        {
            if (string.IsNullOrWhiteSpace(email))
                return false;
            try
            {
                // Normalize the domain
                email = Regex.Replace(email, @"(@)(.+)$", DomainMapper,
                                      RegexOptions.None, TimeSpan.FromMilliseconds(200));
                // Examines the domain part of the email and normalizes it.
                string DomainMapper(Match match)
                {
                    var idn = new IdnMapping();
                    string domainName = idn.GetAscii(match.Groups[2].Value);
                    return match.Groups[1].Value + domainName;
                }
            }
            catch (RegexMatchTimeoutException e)
            {
                MessageBox.Show(e.Message);
                return false;
            }
            catch (ArgumentException e)
            {
                MessageBox.Show(e.Message);
                return false;
            }

            try
            {
                return Regex.IsMatch(email,
                    @"^[^@\s]+@[^@\s]+\.[^@\s]+$",
                    RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
            }
            catch (RegexMatchTimeoutException)
            {
                return false;
            }
        }
        private void backBtn_Click(object sender, EventArgs e)
        {
            Close();
            Authorization authorization = new Authorization();
            authorization.Show();
        }
        private void enterBtn_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(mailText.Text))
            {
                MessageBox.Show("Заполните поле!");
            }
            if (IsValidEmail(mailText.Text) == false)
            {
                MessageBox.Show("Почта введена некорректно!");
                return;
            }
            else
            {
                MailGet.Email = mailText.Text;
                MailGet.SMS = mailText.Text;
                using (var db = new ARMClassesDataContext())
                {
                    var user = db.Пользователи.FirstOrDefault(u => mailText.Text == u.Почта);
                    if (user != null)
                    {
                        CheckMail check = new CheckMail();
                        check.ShowDialog();
                        if (check.flag == true)
                        {
                            PasswordSubmit passwordSubmit = new PasswordSubmit();
                            passwordSubmit.Show();
                            this.Close();
                        }
                        else
                        {
                            return;
                        }
                    }
                    else
                    {
                        MessageBox.Show("Пользователь с такой почтой не найден");
                    }
                }
            }
        }

        private void enterBtn_MouseMove(object sender, MouseEventArgs e)
        {
            enterBtn.ForeColor = Color.FromArgb(24, 186, 96);
            enterBtn.FlatAppearance.BorderColor = Color.FromArgb(24, 186, 96);
        }

        private void enterBtn_MouseLeave(object sender, EventArgs e)
        {
            enterBtn.ForeColor = Color.Black;
            enterBtn.FlatAppearance.BorderColor = Color.Black;
        }

        private void backBtn_MouseMove(object sender, MouseEventArgs e)
        {
            backBtn.ForeColor = Color.FromArgb(24, 186, 96);
            backBtn.FlatAppearance.BorderColor = Color.FromArgb(24, 186, 96);
        }

        private void backBtn_MouseLeave(object sender, EventArgs e)
        {
            backBtn.ForeColor = Color.Black;
            backBtn.FlatAppearance.BorderColor = Color.Black;
        }
    }
}