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What does “Object reference not set to an instance of an object” mean? [duplicate]
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Variables in .NET are either reference types or value types. Value types are primitives such as integers and booleans or structures (and can be identified because they inherit from System.ValueType). Boolean variables, when declared, have...
What's the difference between Unicode and UTF-8? [duplicate]
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Ok, by why did MS perpetuate this into .NET? Wasn't .NET a post-Win2k invention?
– President James K. Polk
Oct 17 '10 at 3:59
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AWK: Access captured group from line pattern
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You can use GNU awk:
$ cat hta
RewriteCond %{HTTP_HOST} !^www\.mysite\.net$
RewriteRule (.*) http://www.mysite.net/$1 [R=301,L]
$ gawk 'match($0, /.*(http.*?)\$/, m) { print m[1]; }' < hta
http://www.mysite.net/
sha...
How to parse a CSV file using PHP [duplicate]
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Just use the function for parsing a CSV file
http://php.net/manual/en/function.fgetcsv.php
$row = 1;
if (($handle = fopen("test.csv", "r")) !== FALSE) {
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$num = count($data);
echo "<p> $num fields in line $r...
Using the rJava package on Win7 64 bit with R
...o not work! Mirrors are not up-to-date, so go to the source at www.rforge.net: http://www.rforge.net/rJava/files/. Note the advice there
“Please use
`install.packages('rJava',,'http://www.rforge.net/')`
to install.”
That is almost correct. This actually works:
install.packages('rJava', .l...
On a CSS hover event, can I change another div's styling? [duplicate]
...s after #a in the HTML.
If #b comes immediately after #a: http://jsfiddle.net/u7tYE/
#a:hover + #b {
background: #ccc
}
<div id="a">Div A</div>
<div id="b">Div B</div>
That's using the adjacent sibling combinator (+).
If there are other elements between #a and #b, y...
LINQ query on a DataTable
...taRow>() on Rows. Better to use AsEnumerable().
– NetMage
Jan 15 at 23:48
1
@NetMage this work...
Why must we define both == and != in C#?
...n't create a class like this in C#, you can use one that was compiled for .NET. It's obvious it will use our overloaded operator for == So, what does the runtime use for !=?
The C# EMCA standard has a whole bunch of rules (section 14.9) explaining how to determine which operator to use when eva...
IIS7 Overrides customErrors when setting Response.StatusCode?
... Worked well in Azure for me. Server headers Server:Microsoft-IIS/8.5 X-AspNet-Version:4.0.30319 X-AspNetMvc-Version:5.2 X-Powered-By:ASP.NET
– oxfn
Oct 5 '15 at 13:10
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What is the difference between a web API and a web service?
...ient stubs automatically. Web Services are based on the SOAP protocol.
ASP.NET Web API is a newer Microsoft framework which helps you to build REST based interfaces. The response can be either JSON or XML, but there is no way to generate clients automatically because Web API does not offer a service...