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Answers and rating deltas for
In C#, what is the `?` in the type `DateTime?`
| Author | Votes | Δ |
|---|---|---|
| Justin Niessner | 27 | +1.19 |
| jason | 4 | -0.12 |
| hackerhasid | 0 | -1.03 |
| Ian Robinson | 0 | -1.60 |
| Richard Everett | 0 | -0.61 |
| Sam Holder | 0 | -1.06 |
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