private void Button1_Click(object sender, EventArgs e)
        {
            if (isNew)
            {
                id = MainModel.GetCountRecords() + 1;
            }

            int jobID = string.IsNullOrWhiteSpace(comboBox1.Text)
                ? 0
                : JobsModel.GetOneJobs(comboBox1.Text).First().Id;

            bool isCorrectSalary = Double.TryParse(textBox10.Text, out double salary);

            if (!isCorrectSalary)
            {
                MessageBox.Show("Зарплата не вірна");
                return;
            }

            var main = new MainTable
            {
                Id               = id,
                FName            = textBox2.Text, // Top
                MName            = textBox3.Text,
                LName            = textBox1.Text,
                JobId            = jobID,
                TimeTableNum     = textBox9.Text, // Middle Main
                IndividualTaxNum = textBox8.Text,
                Sex              = comboBox3.Text.Equals("Чоловік"),
                EmploymentDate   = dateTimePicker2.Value.Date,
                DateDismissal    = dateTimePicker3.Value.Date,
                UpdateAt         = DateTime.Today,
                Email            = textBox5.Text,
                TelWork          = textBox6.Text,
                TelHome          = textBox7.Text,
                About            = textBox4.Text,
                Salary           = salary,
                IsActivity       = comboBox2.Text.Equals("Працює") // Bottom
            };

            int isUpdated = isNew ? MainModel.Insert(main) : MainModel.Update(main);

            if (isUpdated == 1)
            {
                if (isNew)
                {
                    EmployeesLV.AddOneData(id);
                }
                else
                {
                    EmployeesLV.UpdateOneData(id);
                }

                EmployeesLV.UpdateSelected();
                label19.BackColor = Color.DarkSlateGray;
                label19.Text      = "Збережено";
            }
            else
            {
                label19.BackColor = Color.FromArgb(185, 46, 59);
                label19.Text      = "Не збережено";
            }

            label19.Visible = true;
            timer1.Enabled  = true;
        }