c 23 check if mysql query modified rows

1try
2        {
3            connection.Open();
4            cmd = connection.CreateCommand();
5            cmd.CommandText = "INSERT INTO BOOK(ISBN, title, author, publisher,imgPath, catalogID) VALUES ('" + isbn + "','" + title + "','" + author + "','" + publisher + "','" + localPath + "','" + catalogid + "')";
6            int a= cmd.ExecuteNonQuery();
7             if(a>0)
8               //updated.
9             else
10              //Not updated.
11        }
12catch (Exception)
13        {
14           //Not updated.
15        }