private void BinaryOperation() { Set resultSet = new Set(""); string operationName = binaryOperationComboBox.Text.Substring(0, binaryOperationComboBox.Text.Length - 1) + "я"; switch (binaryOperationComboBox.SelectedIndex) { case 0: resultSet = field.Disjunction(firstBinarySetComboBox.SelectedIndex, secondBinaryComboBox.SelectedIndex); break; case 1: resultSet = field.Conjuction(firstBinarySetComboBox.SelectedIndex, secondBinaryComboBox.SelectedIndex); break; } AddSetDialog(resultSet, operationName); }