private void button1_Click(object sender, EventArgs e)
        {
            using (BankDbEntities bank = new BankDbEntities())
            {
                bank.Kredits.Add(new Kredit()
                {
                    User_id = bank.People.ToList().Last().Id, time = dateTimePicker1.Value, price = Convert.ToInt32(textBox3.Text)
                });

                bank.SaveChanges();
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            using (BankDbEntities bank = new BankDbEntities())
            {
                bank.People.Add(new Person()
                {
                    Name = textBox1.Text, Surname = textBox2.Text, PassportNumber = textBox3.Text
                });

                bank.SaveChanges();
            }

            SecondForm secondForm = new SecondForm();

            secondForm.ShowDialog();
        }