private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: This line of code loads data into the 'segaDBDataSet1.Employee' table. You can move, or remove it, as needed.
            this.employeeTableAdapter.Fill(this.segaDBDataSet.Employee);
            gvEmployees.DataSource = BusinessLogic.getEmployeesList();
            gvEmployees.Columns["ID"].IsVisible = false;
            gvEmployees.Columns["FirstName"].IsVisible = false;
            gvEmployees.Columns["LastName"].IsVisible = false;
            gvEmployees.Columns["FullName"].HeaderText = "Полное имя";
            gvEmployees.Columns["Salary"].HeaderText = "Зарплата";
            gvEmployees.Columns["Phone"].HeaderText = "Телефон";
            gvEmployees.Columns["BirthDate"].HeaderText = "Дата рождения";
        }