O.Henry's Style of Writing from Wiki Answers

O. Henry is famed for his 'twist' endings, and as such, many of his short stories fall into a formula. That said, it's a pretty good formula, and if more writers that are published could find themselves a formula that works as well it would be alot better world to read in. Yet, even the best of formulae lend themselves to needless repetition and predictability. While there are a handful of tales that are great, most are merely solid, for O. Henry lacks a modern feel to his character development. In one tale he can be as realistic as turn of the Twentieth Century fiction can be and in the next he can give merely slight caricatures and corny sight gags.
Among his greatest tales are some of his most famous, like The Social Triangle which humorously skewers classism by having a down and out protagonist named Ikey Snigglefritz end up the object of affection to a gratuitous, social climber. Here is that tale's classic end:
The big pale-gray auto with its shining metal work looked out of place moving slowly among the push carts and trash-heaps on the lower east side. So did Cortlandt Van Duyckink, with his aristocratic face and white, thin hands, as he steered carefully between the groups of ragged, scurrying youngsters in the streets. And so did Miss Constance Schuyler, with her dim, ascetic beauty, seated at his side.
'Oh, Cortlandt,' she breathed, 'isn't it sad that human beings have to live in such wretchedness and poverty? And you- how noble it is of you to think of them, to give your time and money to improve their condition!'
'It is little,' he said, sadly, 'that I can do. The question is a large one, and belongs to society. But even individual effort is not thrown away. Look, Constance! On this street I have arranged to build soup kitchens, where no one who is hungry will be turned away. And down this other street are the old buildings that I shall cause to be torn down and there erect others in place of those death-traps of fire and disease.'
Down Delancey