private void btUpdateBurden_Click(object sender, EventArgs e)
        {
            DataBaseProcedure procedure = new DataBaseProcedure();

            procedure.spBurden_Update(Convert.ToInt32(dgvBurden.CurrentRow.Cells[0].Value.ToString()),
                                      ltbEmployeeBurden.SelectedValue.ToString(),
                                      Convert.ToInt32(ltbDiscipline.SelectedValue.ToString()),
                                      Convert.ToInt32(cbGroup.SelectedValue.ToString()), (int)nudCourse.Value);
        }