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You could ask them questions they are unlikely to find in most books:
* When does a class static constructor get run?
* What does the Conditional attribute do? Or, if you're feeling more friendly to the candidate: When you call a Debug.Assert(), do the arguments get evaluated in release builds?
* What's a debugger display attribute and why would you use it?
* In a lambda function, is it possible to use a function that returns void? For example, can something like Console.WriteLine() be used in a lambda function?
* What don't you like about C#? Or: In your opinion, what did Microsoft get wrong in the C# language? I particularly like this question, and I don't care about what their answer is, but merely that they have and answer and can defend their position.
Only caveat, if you don't use these things in your codebase, and don't want to start, I wouldn't use them as interview questions. Otherwise, you might be filtering out candidates that could be good additions to your team.
kdmote wrote: not to make the candidates write or debug actual code in the interview, with the possible exception of FizzBuzz.
Bonus points if you have them write it as a LINQ statement 
We can program with only 1's, but if all you've got are zeros, you've got nothing.
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I don't consider myself a super strong C# and even I could answer those questions. I'd think if they couldn't answer those then they aren't mid-level devs. In fact, I might use that list myself for interviews.
Jeremy Falcon
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kdmote wrote: How do you inherit a class, and why might you want to?
I think a relative has to die, and that's not fun to think about.
kdmote wrote: What is the purpose of interfaces, and how are they helpful?
It's all about the interaction, like we're interfacing right now.
kdmote wrote: Why would you ever want to make a method private or protected?
There are just some things you don't want to have witnesses for
kdmote wrote: Can you explain what a lambda is, and why you might use one
A lambda is a baby sheepda, and it's used to distract rednecks from noticing your own private methods.
kdmote wrote: Why might you use a property instead of a regular variable?
You can't do anything without property.
kdmote wrote: Are you familiar with any "Design Patterns"?
My wife is the seamstress in the house...
kdmote wrote: Have you heard of the concept of "tight" or "loose coupling",
Yes, but now we're solidly back into that private methods/no witnesses thing.
kdmote wrote: Have you used a Unit Testing framework?
Yeah, but I found out my unit was just fine.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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Software Zen: delete this;
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He needed a mid level developer but due to your talent you have been promoted to senior development manager
Zen and the art of software maintenance : rm -rf *
Maths is like love : a simple idea but it can get complicated.
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I think a good mid-level C# developer would have a solid command of most of the canned classes and collections. I personally would ask them to hand write code or psuedo-code for loading a CSV file and run some basic analysis on it such as summing and averaging values from two or three of the columns. If they properly use the System.IO, System.Collections, and possibly System.Data classes and proper flow control, they are ready for a more technical interview. I would follow up with questions on when to use interfaces, what the null coalescing and null conditional operators are used for, and explain lambda expressions just to gauge if they have been keeping up with how the language has evolved.
if (Object.DividedByZero == true) { Universe.Implode(); }
Meus ratio ex fortis machina. Simplicitatis de formae ac munus. -Foothill, 2016
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kdmote wrote: looking for a mid-level C# developer
Ugh. All those questions a mid-level developer should be able to answer, and you should have been able to glean from their resume / github / LinkedIn that they are capable of answering those questions.
Even for mid-level developers, I would stick with questions that are more open ended and tell you about their thinking process.
Marc
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Those are good questions, but I'd also ask some questions pertaining to the other tiers, such as database and UI.
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Since most of the questions are so vague that they need 1,000-word answers, they're probably hoping to publish a book with material stolen from interview answers.
I wanna be a eunuchs developer! Pass me a bread knife!
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Whatever questions you decide on, encode them with ROT13. 
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Long while ago (7+ years ago ) I was at the receiving end of interview questions. All technical questions being fired at me by 4 people from the company and one of them completely threw me off when all of a sudden one of them asked me "design a zoo". Now I am in a zone to answer technical questions like language syntax and why one thing over other etc and bam..Till date I remember that interview because it was so odd. So you can add that to your list or not !
Zen and the art of software maintenance : rm -rf *
Maths is like love : a simple idea but it can get complicated.
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I got laser eye surgery a month ago, but I still can't shoot lasers out of my eyes.
Am I doing it wrong, or should I be asking for a refund?
What I have tried:
Shooting laser beams out of my eyes.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Try rebooting!
In this present crisis, government is not the solution to our problem; government is the problem. ~ Ronald Reagan
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We're not here to do your homework. You won't learn anything by getting other people to write your code for you and it's unfair on your classmates.
Try attaching a debugger to your eyeballs and step through the code (assuming that you've actually bothered to write some) a line at a time. It's most likely an incorrect binding path for what it's worth.
Slogans aren't solutions.
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uninstall the updates
try again next Tuesday
Sin tack ear lol
Pressing the any key may be continuate
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Ah, easy mistake to make. You need administrative access for that. Try "sudo".
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Try drinking some Rhodamine 6G. If that doesn't work, try injecting it into your eyes.
(I am not responsible for any adverse effects due to following this advice.)
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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I've built a few lasers, some 'from scratch' - and I'll give you one bit of helpful essential advice: Sheep Are Not The Answer!
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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The lasers are still installing patches. Have them downgrade the OS to W7. 
Marc
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I also keep pressing the home button on my iphone at work, but it never worked either
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You obviously didn't use the search function, to see if our question has already been answered.
Deleting as duplicate.
I wanna be a eunuchs developer! Pass me a bread knife!
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For one I hate that they sell applications no-one wrote, and then push you to complete it yesterday...
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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"Don't sell the skin of the bear, until it is dead"
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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