try
            {

                string commText = "DELETE from студенты WHERE  ИИН_студ like " + dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[0].Value ;
           
                OleDbCommand comm = new OleDbCommand(commText, conn);
                comm.Parameters.AddWithValue("@rowIndex", dataGridView1.CurrentRow.Index);
                conn.Open();
                comm.ExecuteNonQuery(); //выполняем запрос
                MessageBox.Show("Запись удалена");
                ///////////////

                ////////////////
            }
            catch (Exception ae)
            {
                MessageBox.Show(ae.Message);
            }
            conn.Close();

            try
            {

                ///////////////
                //           DELETE FROM Customers WHERE CustomerName='Alfreds Futterkiste' AND ContactName='Maria Anders'; 
                string sql = "DELETE from УчебныеЗаведения  WHERE  БИН_уч_зав LIKE " + dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[0].Value;
                OleDbCommand command = new OleDbCommand(sql, connection);
                OleDbDataReader dataReader = command.ExecuteReader();

                MessageBox.Show("Запись удалена");
                ////////////////
            }
            catch (Exception ae)
            {
                MessageBox.Show(ae.Message);
            }