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Why use 'virtual' for class properties in Entity Framework model definitions?

In the following blog: http://weblogs.asp.net/scottgu/archive/2010/07/16/code-first-development-with-entity-framework-4.aspx ...
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What does “atomic” mean in programming?

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how do you filter pandas dataframes by multiple columns

To filter a dataframe (df) by a single column, if we consider data with male and females we might: 6 Answers ...
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Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc

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Maven: Command to update repository after adding dependency to POM

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Are email addresses case sensitive?

I've read that by standard first part of e-mail is case sensitive, however I've tried to send e-mail to name@example.com , Name@example.com and NAME@example.com - it has arrived in each case. ...
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Postgres: “ERROR: cached plan must not change result type”

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Controlling the screenshot in the iOS 7 multitasking switcher

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How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?

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Process all arguments except the first one (in a bash script)

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