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Redis cache vs using memory directly

I have not used Redis yet, but I heard about it and plan to try it as cache storing. 2 Answers ...
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“Insert if not exists” statement in SQLite

I have an SQLite database. I am trying to insert values ( users_id , lessoninfo_id ) in table bookmarks , only if both do not exist before in a row. ...
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In which situations do we need to write the __autoreleasing ownership qualifier under ARC?

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URL Encoding using C#

I have an application which sends a POST request to the VB forum software and logs someone in (without setting cookies or anything). ...
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Convert Dictionary to semicolon separated string in c#

Simple one to start the day, given a Dictionary<string, string> as follows: 4 Answers ...
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compilation warning: no rule to process file for architecture i386

How can I resolve this warning? 5 Answers 5 ...
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Should I use AppDomain.CurrentDomain.BaseDirectory or System.Environment.CurrentDirectory?

I have two exe files in the same folder, I can run exe2 from a button in exe1. Today I was observing a customer over a remote (terminal services) session and exe2 failed to run 'File not found' error, yet exe1 was in the same directory when we checked. So should I be using AppDomain.CurrentDomain.B...
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What does SQL clause “GROUP BY 1” mean?

Someone sent me a SQL query where the GROUP BY clause consisted of the statement: GROUP BY 1 . 6 Answers ...
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Why is JsonRequestBehavior needed?

Why is Json Request Behavior needed? 5 Answers 5 ...
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Node.js app can't run on port 80 even though there's no other process blocking the port

I'm running an instance of Debian on Amazon EC2 with Node.js installed. If I run the code below: 9 Answers ...