sasion3/Form1.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;

namespace WindowsFormsApp22222
{
    public partial class Form1 : Form
    {
        Timer timer1 = new Timer();
        int a = 0;
        int i = 10;
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)

        {
            if (string.IsNullOrEmpty(textBox1.Text) || string.IsNullOrEmpty(textBox2.Text))
            {
                MessageBox.Show("Write login or password!");
                a = a + 1;
                if (a == 3)
                {
                    label3.Text = String.Format("Подождите {0} секунд", i);
                    button1.Enabled = false;
                    Timer timer = new Timer();
        timer.Interval = 1000;
                    timer.Tick += new EventHandler(timer_Tick);
        timer.Start();
                }
                else
                {
                    return;
                }
            }
            else
{
    using (var db = new rewqEntities())
    {
        var user = db.Users.AsNoTracking().FirstOrDefault(u => u.Email == textBox1.Text && u.Password == textBox2.Text);
        if (user == null)
        {
            a = a + 1;
            MessageBox.Show("User not founded!");
            if (a == 3)
            {
                label3.Text = String.Format("Подождите {0} секунд", i);
                button1.Enabled = false;
                Timer timer = new Timer();
                timer.Interval = 1000;
                timer.Tick += new EventHandler(timer_Tick);
                timer.Start();
            }
            return;
        }
        else
        {
            a = 0;
            if (user.RoleID == 1)
            {
                Form2 ad = new Form2();
                ad.Show();
                Hide();
            }
            else
            {
                MessageBox.Show("Error");
            }
        }
    }
}
        }
        void timer_Tick(object sender, EventArgs e)
        {
            label3.Text = String.Format("Подождите {0} секунд", --i);
            if (i == 0)
            {
                button1.Enabled = true;
                label3.Text = "";
                (sender as Timer).Stop();
                a = 0;
                i = 10;
            }
        }





        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}