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When to use margin vs padding in CSS [closed]

When writing CSS, is there a particular rule or guideline that should be used in deciding when to use margin and when to use padding ? ...
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Dialog to pick image from gallery or from camera

Is there a standard way to call dialog box with choose either to pick an image from the camera or to get from gallery (like in build-in phone book or Skype)? ...
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MySQL: Can't create table (errno: 150)

I am trying to import a .sql file and its failing on creating tables. 34 Answers 34 ...
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Looping through localStorage in HTML5 and JavaScript

...as thinking I could just loop through localStorage like a normal object as it has a length. How can I loop through this? 7 ...
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How to split a string into an array of characters in Python?

I've tried to look around the web for answers to splitting a string into an array of characters but I can't seem to find a simple method ...
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EOFError: end of file reached issue with Net::HTTP

...TP.new(parsed_url.host, parsed_url.port) http.use_ssl = true Note the additional http.use_ssl = true. And the more appropriate code which would handle both http and https will be similar to the following one. url = URI.parse(domain) req = Net::HTTP::Post.new(url.request_uri) req.set_form_data({'...
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How do I access the request object or any other variable in a form's clean() method?

... The answer by Ber - storing it in threadlocals - is a very bad idea. There's absolutely no reason to do it this way. A much better way is to override the form's __init__ method to take an extra keyword argument, request. This stores the request in the ...
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In C#, can a class inherit from another class and an interface?

I want to know if a class can inherit from a class and an interface. The example code below doesn't work but I think it conveys what I want to do. The reason that I want to do this is because at my company we make USB, serial, Ethernet, etc device. I am trying to develop a generic component/interfa...
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dd: How to calculate optimal blocksize? [closed]

...o you calculate the optimal blocksize when running a dd ? I've researched it a bit and I've not found anything suggesting how this would be accomplished. ...
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Git says “Warning: Permanently added to the list of known hosts”

Every time I use git to interact with a remote, such as when pulling or pushing, I am shown the following message: 15 Answe...