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In MVVM should the ViewModel or Model implement INotifyPropertyChanged?

Most MVVM examples I have worked through have had the Model implement INotifyPropertyChanged , but in Josh Smith's CommandSink example the ViewModel implements INotifyPropertyChanged . ...
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Is quoting the value of url() really necessary?

...racter. If you have special characters in your URL, you should use quotes or escape the characters (see below). Syntax and basic data types The format of a URI value is 'url(' followed by optional white space followed by an optional single quote (') or double quote (") character followed by th...
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What's the difference of strings within single or double quotes in groovy?

Is there any difference? Or just like javascript to let's input ' and " easier in strings? 2 Answers ...
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Should I use scipy.pi, numpy.pi, or math.pi?

In a project using SciPy and NumPy, should I use scipy.pi , numpy.pi , or math.pi ? 2 Answers ...
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PostgreSQL error 'Could not connect to server: No such file or directory'

Like some others I am getting this error when I run rake db:migrate in my project or even try most database tasks for my Ruby on Rails 3.2 applications. ...
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C++ catch blocks - catch exception by value or reference? [duplicate]

... The standard practice for exceptions in C++ is ... Throw by value, catch by reference Catching by value is problematic in the face of inheritance hierarchies. Suppose for your example that there is another type MyException which inherits fro...
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textarea - disable resize on x or y?

... resize: vertical; or resize: horizontal; Quick fiddle: http://jsfiddle.net/LLrh7Lte/ share | improve this answer | ...
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Difference between thread's context class loader and normal classloader

What is the difference between a thread's context class loader and a normal class loader? 4 Answers ...
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How to log something in Rails in an independent log file?

In rails I want to log some information in a different log file and not the standard development.log or production.log. I want to do this logging from a model class. ...
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What are inline namespaces for?

...mbol versioning, but implemented purely at the C++11 level (ie. cross-platform) instead of being a feature of a specific binary executable format (ie. platform-specific). It is a mechanism by which a library author can make a nested namespace look and act as if all its declarations were in the surr...