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Error to use a section registered as allowDefinition='MachineToApplication' beyond application level

The top line in all of my aspx pages in my /portal/ directory has this error message, and I know it's a common one. I have googled this error message to no end, and I see a lot of posts telling me to configure the /portal/ folder as an application in IIS (which I have), and more posts telling me I ...
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Why must we define both == and != in C#?

The C# compiler requires that whenever a custom type defines operator == , it must also define != (see here ). 13 Answe...
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Does the default constructor initialize built-in types?

Does the default constructor (created by the compiler) initialize built-in-types? 7 Answers ...
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Using git, how do I ignore a file in one branch but have it committed in another branch?

I've got a project that I'm deploying to Heroku . The source code tree includes a bunch of mp3 files (the website will be for a recording project I was heavily involved with). ...
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What are the rules about using an underscore in a C++ identifier?

It's common in C++ to name member variables with some kind of prefix to denote the fact that they're member variables, rather than local variables or parameters. If you've come from an MFC background, you'll probably use m_foo . I've also seen myFoo occasionally. ...
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In C#, What is a monad?

...s that monads are a functional language concept, and thus the examples are in languages I haven't worked with (since I haven't used a functional language in depth). I can't grasp the syntax deeply enough to follow the articles fully ... but I can tell there's something worth understanding there. ...
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“Content is not allowed in prolog” when parsing perfectly valid XML on GAE

I've been beating my head against this absolutely infuriating bug for the last 48 hours, so I thought I'd finally throw in the towel and try asking here before I throw my laptop out the window. ...
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How do you get the magnitude of a vector in Numpy?

In keeping with the "There's only one obvious way to do it", how do you get the magnitude of a vector (1D array) in Numpy? ...
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Setting up a common nuget packages folder for all solutions when some projects are included in multi

I have been using NuGet to retrieve packages from external and internal package sources, which is very convenient. But I have realized that the packages are by default stored per solution, which is very frustrating when some projects with NuGet references are included in several solutions. Then the ...
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filter items in a python dictionary where keys contain a specific string

I'm a C coder developing something in python. I know how to do the following in C (and hence in C-like logic applied to python), but I'm wondering what the 'Python' way of doing it is. ...