private void button2_Click(object sender, EventArgs e) { foreach (DataGridViewRow row in dataGridView1.SelectedRows) { dataGridView1.Rows.Remove(row); if (typebook == "Учебная литература") { book.Remove(book.ElementAt(dataGridView1.CurrentRow.Index).Key); } if (typebook == "Журналы") { jorgazet.Remove(jorgazet.ElementAt(dataGridView1.CurrentRow.Index).Key); } } }