How to return an error to ValidationSummry in MVC 3

StackOverflow https://stackoverflow.com/questions/6398691

문제

I have an idea which I dont know how to implement. In MVC 3 controller I have an if statement, and I want the controller to return an error message if the if statement fails. And I have a ValidationSummery on that page, so its better if it will catch the error message and present it..

How do I do this?

Thanks

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