private void buttonAddEmployee_Click(object sender, EventArgs e)
        {
            int    customer    = 0;
            string strCustomer = string.Empty;

            if (comboBoxCustomer.SelectedIndex > -1)
            {
                strCustomer = comboBoxCustomer.SelectedItem.ToString();
            }
            int    employee    = 0;
            string strEmployee = string.Empty;

            if (comboBoxEmployee.SelectedIndex > -1)
            {
                strEmployee = comboBoxEmployee.SelectedItem.ToString();
            }
            int    level    = 0;
            string strLevel = string.Empty;

            if (comboBoxLevel.SelectedIndex > -1)
            {
                strLevel = comboBoxLevel.SelectedItem.ToString();
            }
            int    type    = 0;
            string strType = string.Empty;

            if (comboBoxAgreement.SelectedIndex > -1)
            {
                strType = comboBoxAgreement.SelectedItem.ToString();
            }
            if ((strCustomer != string.Empty) && (strEmployee != string.Empty) && (strLevel != string.Empty) && (strType != string.Empty))
            {
                foreach (var c in bl.GetCustomersList())
                {
                    if (c.FullName == strCustomer)
                    {
                        customer = c.ID;
                        break;
                    }
                }
                foreach (var emp in bl.GetEmployeesList())
                {
                    if (emp.FullName == strEmployee)
                    {
                        employee = emp.ID;
                        break;
                    }
                }
                foreach (var l in bl.GetHopelessnessLevelsList())
                {
                    if (l.Name == strLevel)
                    {
                        level = l.ID;
                        break;
                    }
                }
                foreach (var t in bl.GetAgreementTypesList())
                {
                    if (t.Name == strType)
                    {
                        type = t.ID;
                        break;
                    }
                }
                bl.AddDeal(customer, employee, level, type);
                this.Close();
            }
            else
            {
                MessageBox.Show("Данные не введены!");
            }
        }