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Editorial Team
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Asked: 2026-05-25T12:51:28+00:00

This question has probably been asked before in some shape of form before, but

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This question has probably been asked before in some shape of form before, but I haven’t seen an answer in the context of winform and usercontrols.

From what I understand usercontrols and winform should have parameterless constructors (so they work properly in the designer). As a result, using properties is a good work around. However, what exception should you throw (if any) if an important property is not set?

Is it a good idea to throw an argument null exception from a property getter? Or should I be checking at the beginning of a methods, and throw the exception from there?

Any help would be most appreciated.

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1 Answer

  1. Editorial Team

    InvalidOperationException seems appropriate. The operation is invalid given an object’s current state. However, I have also seen it said that you should not throw framework exceptions, but derive your own. I’m not sure what to believe.

    Edit: Based on the example at http://msdn.microsoft.com/en-us/library/xhcbs8fz.aspx I think it would be OK to throw an InvalidOperationException so long as the message is specific.

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