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Why must we define both == and != in C#?

...ality operator, that all objects have, there is not an overload for it.1 Knowing that this is the case, the real question is: Why was this designed in this way and why doesn't the compiler figure it out on its own? A lot people are saying this wasn't a design decision, but I like to think it was t...
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What's the difference between @Component, @Repository & @Service annotations in Spring?

...for any class that fulfils the role or stereotype of a repository (also known as Data Access Object or DAO). Among the uses of this marker is the automatic translation of exceptions, as described in Exception Translation. Spring provides further stereotype annotations: @Component, @Servic...
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CSS Selector for

... Ok I had tried this but it didn't work now it is working so I must have my syntax messed up. – JoshBerke Jan 22 '09 at 21:07 ...
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Scheduling R Script

... Now there is built in option in RStudio to do this, to run scheduler first install below packages install.packages('data.table') install.packages('knitr') install.packages('miniUI') install.packages('shiny') insta...
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What's the optimum way of storing an NSDate in NSUserDefaults?

... For the record - 32 bit floats have only 24 bits for accuracy, so 1970 to now is 40 years, which is 40*365*86400 seconds, and (40 * 365 * 86 400) / (2 ** 24) = 75second error. Double precision is what a DateTime interval, and its RAW precision is now better than a millionth of a second. ...
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Can you use hash navigation without affecting history?

... Edit: It's been a couple years now, and browsers have evolved. @Luxiyalu's answer is the way to go --Old Answer-- I too think it is impossible (at this time). But why do you need to change the hash value if you are not going to use it? I believe the ma...
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Getting “type or namespace name could not be found” but everything seems ok?

... Thanks - this helped just now. I recently moved the solution to VS2012 from VS2010, and had created one new class library in VS2012. All of a sudden I was getting this error, and of course it was because the new class library targeted .NET 4.5 while t...
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difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass

...ctivity.this and getBaseContext, they all offer reference to the context. Now the thing confuses is the declaration of different contexts and their specific-usage. To make things simple, you should count two types of context available in the Android framework. Application Context Activity Context...
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Get pandas.read_csv to read empty values as empty string instead of nan

... Documentation for read_csv now offers both na_values (list or dict indexed by columns) and keep_default_na (bool). The keep_default_na value indicates whether pandas' default NA values should be replaced or appended to. The OP's code doesn't work curre...
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How to use SVN, Branch? Tag? Trunk?

... of your earlier answers suggested, for different development paths; right now for one of our programs we have 3 active branches: 1 for the main development, 1 for the as-yet-unfinished effort to parallelise the program, and 1 for the effort to revise it to use XML input and output files; -- we sca...