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Checking to see if a DateTime variable has had a value assigned

Is there an easy way within C# to check to see if a DateTime instance has been assigned a value or not? 9 Answers ...
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How do I get the first element from an IEnumerable in .net?

I often want to grab the first element of an IEnumerable<T> in .net, and I haven't found a nice way to do it. The best I've come up with is: ...
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How to check if character is a letter in Javascript?

I am extracting a character in a Javascript string with: 14 Answers 14 ...
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Your project contains error(s), please fix it before running it

I am developing a simple Android application. But when I run Eclipse, it shows the following error: 26 Answers ...
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How do I determine which iOS SDK I have?

I'm sure this is simple, but how do I determine which version of the iOS SDK I currently have installed? 5 Answers ...
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PHP: How to send HTTP response code?

I have a PHP script that needs to make responses with HTTP response codes (status-codes), like HTTP 200 OK, or some 4XX or 5XX code. ...
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How do I truncate a .NET string?

I would like to truncate a string such that its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype. ...
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How do I put the image on the right side of the text in a UIButton?

I don't want to use a subview if I can avoid it. I want a UIButton with a background image, text, and an image in it. Right now, when I do that, the image is on the left side of the text. The background image, text, and image all have different highlight states. ...
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Check if value is in select list with JQuery

How can I, using JQuery, check if a value belongs to dropdown list or not? 6 Answers 6...
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OnChange event handler for radio button (INPUT type=“radio”) doesn't work as one value

I'm looking for a generalized solution for this. 16 Answers 16 ...