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What is ? in C# variable definition?

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I'm working through the AppHub XNA lab Catapult wars, and have come accross some c# syntax I havn't seen before:

GestureSample? prevSample;
GestureSample? firstSample;

GestureSample is a struct. I've never seen that ? directly after a type before. As you can imagine, googling c# ? didn't get me very far. Can someone explain what it does in this example?

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