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How to export DataTable to Excel

How can I export a DataTable to Excel in C#? I am using Windows Forms. The DataTable is associated with a DataGridView control. I have to export records of DataTable to Excel. ...
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Group by multiple columns in dplyr, using string vector input

I'm trying to transfer my understanding of plyr into dplyr, but I can't figure out how to group by multiple columns. 9 Answ...
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How to ignore whitespace in a regular expression subject string?

Is there a simple way to ignore the white space in a target string when searching for matches using a regular expression pattern? For example, if my search is for "cats", I would want "c ats" or "ca ts" to match. I can't strip out the whitespace beforehand because I need to find the begin and en...
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PHP file_get_contents() and setting request headers

With PHP, is it possible to send HTTP headers with file_get_contents() ? 7 Answers 7...
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What is the difference between currying and partial application?

I quite often see on the Internet various complaints that other peoples examples of currying are not currying, but are actually just partial application. ...
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How can I start an interactive console for Perl?

How can I start an interactive console for Perl, similar to the irb command for Ruby or python for Python? 23 Answers ...
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How to trim a string to N chars in Javascript?

How can I, using Javascript, make a function that will trim string passed as argument, to a specified length, also passed as argument. For example: ...
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Good example of livelock?

I understand what livelock is, but I was wondering if anyone had a good code-based example of it? And by code-based, I do not mean "two people trying to get past each other in a corridor". If I read that again, I'll lose my lunch. ...
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Why should eval be avoided in Bash, and what should I use instead?

Time and time again, I see Bash answers on Stack Overflow using eval and the answers get bashed, pun intended, for the use of such an "evil" construct. Why is eval so evil? ...
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How can I output leading zeros in Ruby?

I'm outputting a set of numbered files from a Ruby script. The numbers come from incrementing a counter, but to make them sort nicely in the directory, I'd like to use leading zeros in the filenames. In other words ...