Each state may have its own criteria for determining residency. If you are only in a state temporarily to attend school, then generally your state residency doesn't change.
If you need to prepare two state returns, prepare the nonresident return first. You may be able to claim a credit on your resident state return for any taxes paid to your nonresident state.
Also, some states have reciprocity agreements so that you normally don't have to prepare two returns if you only receive wages in the nonresident state. See this article for information on states with reciprocity agreements.
See also this TurboTax article and this one on multiple-state situations.
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