private void btInserBurden_Click(object sender, EventArgs e) { DataBaseProcedure procedure = new DataBaseProcedure(); procedure.spBurden_Insert(ltbEmployeeBurden.SelectedValue.ToString(), Convert.ToInt32(ltbDiscipline.SelectedValue.ToString()), Convert.ToInt32(cbGroup.SelectedValue.ToString()), (int)nudCourse.Value); }