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How do I rename the extension for a bunch of files?

In a directory, I have a bunch of *.html files. I'd like to rename them all to *.txt 24 Answers ...
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How to add ASP.NET 4.0 as Application Pool on IIS 7, Windows 7

Configuring servers is not my strong suit by any means. I'm trying to move a development project to Windows 7. One of the things that I need to run the application is to select ASP.NET v4.0 as the application pool within IIS. ...
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Unable to cast object of type 'System.DBNull' to type 'System.String`

I got the above error in my app. Here is the original code 11 Answers 11 ...
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Import .bak file to a database in SQL server

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How to rename with prefix/suffix?

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What is the difference between parseInt(string) and Number(string) in JavaScript? [duplicate]

What is the difference between parseInt(string) and Number(string) in JavaScript? 6 Answers ...
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Set up Heroku and GoDaddy? [closed]

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Set environment variables from file of key/value pairs

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Passing a single item as IEnumerable

Is there a common way to pass a single item of type T to a method which expects an IEnumerable<T> parameter? Language is C#, framework version 2.0. ...
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Passing ssh options to git clone

I'm trying to run git clone without ssh checking the repository host's key. I can do it from ssh like that: 7 Answers ...