How do I tell the compiler that a property is not null when a certain method has been executed?

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How do I tell the compiler that a property is not null when a certain method has been executed?
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Thanks to all those great people for their contributions!

(stackoverflow.com/users/13440841/marvin-klein)Marvin Klein
(stackoverflow.com/users/1086121/canton7)canton7
(stackoverflow.com/users/2641242/jraufeisen)jraufeisen
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null nullable c#




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null
nullable
c#