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What is the difference between up-casting and down-casting with respect to class variable

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.NET - Dictionary locking vs. ConcurrentDictionary

...ructure, which means that if you have code like this: if (tree.Count > 0) Debug.WriteLine(tree.First().ToString()); you might get a NullReferenceException because inbetween tree.Count and tree.First(), another thread has cleared out the remaining nodes in the tree, which means First() will...
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Store pictures as files or in the database for a web app?

My question is fairly generic and I know there might not be an 100% answer to it. I'm building an ASP .NET web solution that will include a lot of pictures and hopefully a fair amount of traffic. I do really want to achieve performance. ...
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How to send password securely over HTTP?

... answered Oct 17 '09 at 19:13 Jeremy PowellJeremy Powell 3,17822 gold badges1818 silver badges2929 bronze badges ...
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Hibernate: “Field 'id' doesn't have a default value”

... answered May 11 '09 at 3:52 André ChalellaAndré Chalella 12.1k99 gold badges4747 silver badges5959 bronze badges ...
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How to take backup of a single table in a MySQL database?

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What is the best way to solve an Objective-C namespace collision?

... +50 If you do not need to use classes from both frameworks at the same time, and you are targeting platforms which support NSBundle unload...
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When and why I should use session_regenerate_id()?

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c++11 Return value optimization or move? [duplicate]

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Is it possible to define more than one function per file in MATLAB, and access them from outside tha

...n that m-file. Functions in other m-files can not call them. Starting in R2016b, you can add local functions to scripts as well, although the scoping behavior is still the same (i.e. they can only be called from within the script). In addition, you can also declare functions within other functions....