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Where is the “Fold” LINQ Extension Method?

I found in MSDN's Linq samples a neat method called Fold() that I want to use. Their example: 2 Answers ...
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PHP prepend associative array with literal keys?

Is it possible to prepend an associative array with literal key=>value pairs? I know that array_unshift() works with numerical keys, but I'm hoping for something that will work with literal keys. ...
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Why can a class not be defined as protected?

Why can we not define a class as protected ? 12 Answers 12 ...
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What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?

I tried researching the difference between cout , cerr and clog on the internet but couldn't find a perfect answer. I still am not clear on when to use which. Can anyone explain to me, through simple programs and illustrate a perfect situation on when to use which one? ...
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How to get image height and width using java?

Is there any other way besides using ImageIO.read to get image height and width? 13 Answers ...
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JavaScript: how to change form action attribute value based on selection?

I'm trying to change the form action based on the selected value from a dropdown menu. 5 Answers ...
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Random record from MongoDB

I am looking to get a random record from a huge (100 million record) mongodb . 26 Answers ...
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Open a file with Notepad in C#

How I open a file in c#? I don't mean reading it by textreader and readline(). I mean open it as an independent file in notepad. ...
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What is the difference between Int and Integer?

In Haskell, what is the difference between an Int and an Integer ? Where is the answer documented? 6 Answers ...
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Missing Push Notification Entitlement

I have an app for submission when it got rejected and I got the message 17 Answers 17 ...