Try:

    help hl-LineNr

I found this through:

    help &#39;number&#39;

which is the way to get help on the `&#39;number&#39;` option, instead of the `:number` command.

To actually change the displayed colour:

    :highlight LineNr ctermfg=grey

This would change the foreground colour for LineNr on a character terminal to grey. If you are using gVim, you can:

    :highlight LineNr guifg=#050505


To change the line numbers permanently add the below to your `.vimrc`

`highlight LineNr term=bold cterm=NONE ctermfg=DarkGrey ctermbg=NONE gui=NONE guifg=DarkGrey guibg=NONE`

 Of course you change the `ctermfg` and `guifg` to whatever color you want.

In MacVim (with Vim 7.3 at it&#39;s core) I&#39;ve found `CursorLineNr` to work:

`hi CursorLineNr guifg=#050505`

I didn&#39;t like the colors provided by the selected color scheme so I modified the color of the line numbers this way:

    colorscheme trivial256    &quot; for light background
    hi LineNr       term=bold cterm=bold ctermfg=2 guifg=Grey guibg=Grey90



I&#39;ve a performance related question regarding use of StringBuilder.
In a very long loop I&#39;m manipulating a `StringBuilder` and passing it to another method like this:

    for (loop condition) {
        StringBuilder sb = new StringBuilder();
        sb.append(&quot;some string&quot;);
        . . .
        sb.append(anotherString);
        . . .
        passToMethod(sb.toString());
    }

Is instantiating `StringBuilder` at every loop cycle is a good solution? And is calling a delete instead better, like the following?

    StringBuilder sb = new StringBuilder();
    for (loop condition) {
        sb.delete(0, sb.length);
        sb.append(&quot;some string&quot;);
        . . .
        sb.append(anotherString);
        . . .
        passToMethod(sb.toString());
    }


Is it better to reuse a StringBuilder in a loop?

I saw a code snippet yesterday in one of the responses here on StackOverflow that intrigued me. It was something like this:

     List&lt;string&gt; myList = new List&lt;string&gt; {&quot;aBc&quot;, &quot;HELLO&quot;, &quot;GoodBye&quot;};

     myList.ForEach(d=&gt;d.ToLower());

I was hoping I could use it to convert all items in myList to lowercase. However, it doesn&#39;t happen... after running this, the casing in myList is unchanged.

So my question is whether there IS a way, using LINQ and Lambda expressions to easily iterate through and modify the contents of a list in a manner similar to this.

Thanks,
Max

How to Convert all strings in List&lt;string&gt; to lower case using LINQ?

I&#39;m looking for a way to configure the color used for line numbering (as in: `:set nu`) in Vim.  The default on most platforms seems to be yellow (which is also used for some highlighted tokens).  I would *like* to color the line numbers a dim gray; somewhere in the vicinity of `#555`.  I&#39;m not picky though, any subdued color would be acceptable.

Vim Configure Line Number Coloring

<p>I'm looking for a way to configure the color used for line numbering (as in: <code>:set nu</code>) in Vim.  The default on most platforms seems to be yellow (which is also used for some highlighted tokens).  I would <em>like</em> to color the line numbers a dim gray; somewhere in the vicinity of <code>#555</code>.  I'm not picky though, any subdued color would be acceptable.</p>


Every time I do an `hg diff file.ext` I end up using a console diff application. I would like to use Kdiff3 or WinMerge (I&#39;m using Windows).

Is there a way to change that? I can&#39;t find a reference in Mercurial documentation (**I&#39;m not talking about merge!**). 


Is possible to change the default diff tool in Mercurial?

I need to use different database connection string and SMTP server address in my ASP.NET application depending on it is run in development or production environment. 

The application reads settings from Web.config file via [WebConfigurationManager.AppSettings][1] property.

I use Build/Publish command to deploy the application to production server via FTP and then manually replace remote Web.config with correct one.

Is it possible somehow simplify the process of deployment? Thanks!


  [1]: http://msdn.microsoft.com/en-us/library/system.web.configuration.webconfigurationmanager.appsettings.aspx

Using different Web.config in development and production environment

When I get a vanilla Windows system, there&#39;s a bunch of stuff I change to make it more developer-friendly.

Some of it I remember every time, other stuff I only do as and when.

Examples:

 - Show extensions of all file types
 - Make hidden and system file visible
 - Turn off Windows Defender

I seem to remember a blog post from Jeff on this topic, but can&#39;t locate it!

What else do you do, and do you have any tools that automate this process?


As a developer, what changes do you make to a vanilla Windows install?

I&#39;d like to set a connection string programmatically, with absolutely no change to any config files / registry keys.

I have this piece of code, but unfortunately it throws an exception with &quot;the configuration is read only&quot;.

    ConfigurationManager.ConnectionStrings.Clear();
    string connectionString = &quot;Server=myserver;Port=8080;Database=my_db;...&quot;;
    ConnectionStringSettings connectionStringSettings = 
      new ConnectionStringSettings(&quot;MyConnectionStringKey&quot;, connectionString);
    ConfigurationManager.ConnectionStrings.Add(connectionStringSettings);

**Edit:**
The problem is that I have existing code that reads the connection string from the configuration. So setting the config string manually, or through a resource, don&#39;t seem like valid options. What I really need is a way to modify the configuration programmatically.

How do I set a connection string config programmatically in .net?

Here&#39;s a standard scenario:

    if(string.IsNullOrEmpty(Configuration.AppSettings[&quot;foobar&quot;]))
       throw new SomeStandardException(&quot;Application not configured correctly, bozo.&quot;);

The problem is, I am not entirely certain *which* exception `SomeStandardException` should be. 

I perused the 3.5 Framework and found two likely candidates: [`ConfigurationException`][1] and [`ConfigurationErrorsException`][2].

&gt; &lt;h2&gt;System.Configuration.ConfigurationException&lt;/h2&gt;
&gt; 
&gt; The exception that is thrown when a
&gt; configuration system error has
&gt; occurred.
&gt; 
&gt; &lt;h3&gt;Remarks&lt;/h3&gt; The
&gt; `ConfigurationException` exception is
&gt; thrown if the application attempts to
&gt; read or write data to the
&gt; configuration file but is
&gt; unsuccessful. Some possible reasons
&gt; for this can include malformed XML in
&gt; the configuration file, file
&gt; permission issues, and configuration
&gt; properties with values that are not
&gt; valid.
&gt; 
&gt; **Note:**
&gt; 
&gt; The `ConfigurationException` object is
&gt; maintained for backward compatibility.
&gt; The `ConfigurationErrorsException`
&gt; object replaces it for the
&gt; configuration system.

This exception actually sounds perfect for what I need, but it&#39;s been marked obsolete, so, ixnay on atthay.

This brings us to the thoroughly puzzling [`ConfigurationErrorsException`][3]:

&gt; &lt;h2&gt;System.Configuration.ConfigurationErrorsException&lt;/h2&gt;
&gt; 
&gt; The current value is not one of the
&gt; EnableSessionState values.

As you can see, its documentation is completely useless. (It&#39;s that way in both local and online help.) An examination of the class itself shows that it&#39;s drastic overkill for what I want. 

In a nutshell, I need a standard exception that should be thrown when an application configuration setting is missing or contains an invalid value. You&#39;d think the Framework had such an exception baked into it for applications to use. (It apparently did, but it was marked obsolete, and was replaced by something *much* larger in scope.)

What solutions, if any, are you guys using for this, and am I going to have to suck it up and roll my own exception for this?

&lt;h2&gt;Edit Addenda&lt;/h2&gt;
Some have asked whether or not I could provide a default value, and continue. In certain cases, yes, and in those cases, the exception would not be thrown. However, for certain settings, this won&#39;t apply. For instance: database server names and credentials, authentication servers, and paths to installed third party applications. 

It is also worth noting that the application I&#39;m primarily working on is a console application running in batch mode, and I want it to throw an exception that is caught by the main method and logged appropriately if the thing isn&#39;t appropriately configured. (It&#39;s legacy code I&#39;ve inherited, and currently just *assumes* everything&#39;s peachy.)


  [1]: http://msdn.microsoft.com/en-us/library/system.configuration.configurationexception.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.configuration.configurationerrorsexception.aspx
  [3]: http://msdn.microsoft.com/en-us/library/system.configuration.configurationerrorsexception.aspx

.NET: Which Exception to Throw When a Required Configuration Setting is Missing?

I am preparing a presentation using Google Slides, though I can also work on the presentation within Open Office that will include code snippets. 

Is there any easy way to perform basic syntax highlighting on the code snippets with either Google Docs or Open Office Presenter?

&lt;b&gt;Edit:&lt;/b&gt; Since I believe that I can find a way to embed HTML, any tools that can perform syntax highlighting on HTML would also be welcome suggestions.

How To Format A Block of Code Within a Presentation?

I spend some time customizing the colors for syntax highlighting in Eclipse (Java, JSP, HTML, CSS, etc.) but whenever I try to export these settings via File|Export|General|Preferences and reimport them, the settings never completely get imported back. Some colors are restored and others are left unchanged, leaving me in an &#39;in between&#39; state - very frustrating.

I&#39;m using Eclipse 3.4 Ganymede, by the way.

Has anyone found a reliable way to save and restore Eclipse syntax highlighting settings?


Eclipse syntax highlighting preferences save and restore

I just recently set up my Vim environment from Textmate, after becoming addicted to its modal input.

However, syntax highlighting seems to be not so beautiful in Vim. I code in C++ and since the function call and class names can&#39;t be highlighted, the code is more difficult to read.  I played with color scheme for a bit, but couldn&#39;t find any field that corresponded to &quot;class name&quot; or &quot;function name&quot;.

In the picture below, notice how `DroughtLayer::` and `*.size()` is not highlighted on the right in MacVim.

[![Picture comparison between Textmate(left) and Vim(right)][1]][1]  
&lt;sub&gt;(source: [ivzhao.com](http://ivzhao.com/temp/vimHL.png))&lt;/sub&gt;  


  [1]: https://i.stack.imgur.com/1cHzr.png


Any ideas how to solve this? It really annoys me as I am so much a visual-sensitive guy.

class &amp; function names highlighting in Vim

I would like to show some C# source code in a PowerPoint presentation. But how can I copy the code ***including the syntax highlighting*** onto the slides? I could make screenshots, but that has some drawbacks (ugly, font size, unmaintainable). Do you have some ideas?

How to: C# source with syntax highlighting on PowerPoint slides

I am trying to add simple syntax highlighting and auto completion for a simple scripting language...

I added syntax highlighting using [this article][1]


  [1]: http://weblogs.asp.net/jgalloway/archive/2006/11/25/creating-a-user-defined-language-in-notepad.aspx

Now I want to know how to enable auto completion with Notepad ++ for my custom language. Does anyone know how to do that?

How can I enable auto complete support in Notepad++?

Is possible to insert a line break where the cursor is in Vim without entering into insert mode? Here&#39;s an example (`[x]` means cursor is on `x`):

    if (some_condition) {[ ]return; }

Occasionally, I might want to enter some more code. So I&#39;d press &lt;kbd&gt;i&lt;/kbd&gt; to get into insert mode, press &lt;kbd&gt;Enter&lt;/kbd&gt; to insert the line break and then delete the extra space. Next, I&#39;d enter normal mode and position the cursor before the closing brace and then do the same thing to get it on its own line.

I&#39;ve been doing this a while, but there&#39;s surely a better way to do it?

How do I insert a linebreak where the cursor is without entering into insert mode in Vim?

I want to read line n1-&gt;n2 from file foo.c into the current buffer.

I tried: `147,227r /path/to/foo/foo.c`

But I get: &quot;E16: Invalid range&quot;, though I am certain that foo.c contains more than 1000 lines.


vim -- How to read range of lines from a file into current buffer

How can I add line numbers to a range of lines in a file opened in Vim? Not as in `:set nu`—this just *displays* line numbers—but actually have them be prepended to each line in the file?

How to add line numbers to range of lines in Vim?

I&#39;m addicted to Vim, it&#39;s now my de facto way of editing text files.

Being that it&#39;s mainly a text editor and not an IDE, has anyone got tricks for me to make it easier when developing Java apps?

Some questions I have:

  - How do I invoke a maven task without leaving vi?
  - Can I get code completion?
  - How&#39;s the syntax highlighting?

Anything else (other than &quot;Don&#39;t do it!&quot;) that I should know about?

Tips for using Vim as a Java IDE?

In [Vim][1], how do I  insert characters at the beginning of each line in a selection?

For instance,  I want to comment out a block of code by prepending `//` at the beginning of each line assuming my language&#39;s comment system doesn&#39;t allow block commenting like `/* */`.  How would I do this?

  [1]: http://en.wikipedia.org/wiki/Vim_%28text_editor%29


Content Type	Original Author	Original Content on Stackoverflow
Question	Daniel Spiewak	View Question on Stackoverflow
Solution 1 - Configuration	Greg Hewgill	View Answer on Stackoverflow
Solution 2 - Configuration	qasimalbaqali	View Answer on Stackoverflow
Solution 3 - Configuration	Roshambo	View Answer on Stackoverflow
Solution 4 - Configuration	Jabba	View Answer on Stackoverflow

Vim Configure Line Number Coloring

Configuration Problem Overview

Configuration Solutions

Solution 1 - Configuration

Solution 2 - Configuration

Solution 3 - Configuration

Solution 4 - Configuration

How to Convert all strings in List<string> to lower case using LINQ?

Is it better to reuse a StringBuilder in a loop?

Attributions