I've broken debugging in Visual Studio. I think I pressed a wrong key

I don't know what I've done. Visual Studio used to stop when it hit an exception and now it just continues and doesn't take me to the offending code.

Does anyone know what I've pressed to turn it off? And how to开发者_开发知识库 turn it back on?

Thanks.

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"Debug" "Exceptions" "Break when an exception is"