public string Save(Book aBook)
{
string message = "";
bool isRegNoExists = bookGateway.IsIsbnNoExists(aBook.Isbn);
if (isRegNoExists)
{
message = "ISBN No already exists!";
}
else
{
int rowsAffected = bookGateway.Insert(aBook);
if (rowsAffected > 0)
{
message = "Saved successfully";
}
else
{
message = "Sorry! Insertion failed.";
}
}
return(message);
}