//Metod som lägger till en person
public Task InsertPerson(Person person)
{
if (string.IsNullOrWhiteSpace(person.FirstName) || string.IsNullOrWhiteSpace(person.LastName) ||
string.IsNullOrWhiteSpace(person.EmailAddress))
{
throw new Exception();
}
const string sql = @"insert into dbo.Person (FirstName, LastName, EmailAddress)" +
"values (@FirstName, @LastName, @EmailAddress)";
return(_sqlDataAccess.ExecuteSqlAsync(sql, person));
}