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What is the correct way to create a single-instance WPF application?

Using C# and WPF under .NET (rather than Windows Forms or console), what is the correct way to create an application that can only be run as a single instance? ...
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How to clear MemoryCache?

I have created a cache using the MemoryCache class. I add some items to it but when I need to reload the cache I want to clear it first. What is the quickest way to do this? Should I loop through all the items and remove them one at a time or is there a better way? ...
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How to convert PascalCase to pascal_case?

... Try this on for size: $tests = array( 'simpleTest' => 'simple_test', 'easy' => 'easy', 'HTML' => 'html', 'simpleXML' => 'simple_xml', 'PDFLoad' => 'pdf_load', 'startMIDDLELast' => 'start_middle_last', 'AString' => 'a_string', 'Some...
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Cron jobs and random times, within given hours

I need the ability to run a PHP script 20 times a day at completely random times. I also want it to run only between 9am - 11pm. ...
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Differences between Exception and Error

I'm trying to learn more about basic Java and the different types of Throwables, can someone let me know the differences between Exceptions and Errors? ...
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MongoDB/Mongoose querying at a specific date?

... That should work if the dates you saved in the DB are without time (just year, month, day). Chances are that the dates you saved were new Date(), which includes the time components. To query those times you need to create a date range that includes all moments in a day. db.posts.find( /...
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Why is “origin/HEAD” shown when running “git branch -r”?

... you run git branch -r why the blazes does it list origin/HEAD ? For example, there's a remote repo on GitHub, say, with two branches: master and awesome-feature. If I do git clone to grab it and then go into my new directory and list the branches, I see this: ...
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How to execute XPath one-liners from shell?

Is there a package out there, for Ubuntu and/or CentOS, that has a command-line tool that can execute an XPath one-liner like foo //element@attribute filename.xml or foo //element@attribute < filename.xml and return the results line by line? ...
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Epoch vs Iteration when training neural networks

What is the difference between epoch and iteration when training a multi-layer perceptron? 13 Answers ...
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How are people unit testing with Entity Framework 6, should you bother?

I am just starting out with Unit testings and TDD in general. I have dabbled before but now I am determined to add it to my workflow and write better software. ...