//Поиск
 private void pictureBoxSearch_Click(object sender, EventArgs e)
 {
     ClassSearch.Search(cbCategorySearch.SelectedIndex, cbSearch, tableBooks);
 }
 //Очистка поля поиска
 private void pictureBoxErase_Click(object sender, EventArgs e)
 {
     ClassSearch.Erase(cbCategorySearch, cbSearch);
     ClassFillTable.FillTable(tableBooks);
 }
 //Работа с поиском
 //Изменение типа поиска
 private void cbCategorySearch_SelectedIndexChanged(object sender, EventArgs e)
 {
     ClassSearch.FillComboBoxSearch(cbCategorySearch, cbSearch);
 }