Can someone define what exactly &#39;POCO&#39; means? I am encountering the term more and more often, and I&#39;m wondering if it is only about plain classes or it means something more?

&#39;POCO&#39; definition

I&#39;ve seen this done in Borland&#39;s [Turbo C++][1] environment, but I&#39;m not sure how to go about it for a C# application I&#39;m working on. Are there best practices or gotchas to look out for?

  [1]: https://en.wikipedia.org/wiki/Turbo_C++


How do I drag and drop files into an application?

&gt; **Possible Duplicate:**  
&gt; [In C# what is the difference between String and string](https://stackoverflow.com/questions/7074/in-c-sharp-what-is-the-difference-between-string-and-string)  

&lt;!-- End of automatically inserted text --&gt;

In C# the string keyword (highlighted in Visual Studio as a data type) is just a shortcut to the String class right?

In that case, it would be the same to use either while coding from the semantic point of view. However, is it the same from the performance point of view? I mean, when the mapping is performed: during compilation (I guess so), during compilation or during JIT compilation in execution? 

Or maybe this is all wrong: string and String are not the same thing in C# so there are some situations where they cannot be interchanged



String vs string in C#

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/7074/in-c-sharp-what-is-the-difference-between-string-and-string" target="_blank" rel="noopener noreferrer">In C# what is the difference between String and string</a>

In C# the string keyword (highlighted in Visual Studio as a data type) is just a shortcut to the String class right?
In that case, it would be the same to use either while coding from the semantic point of view. However, is it the same from the performance point of view? I mean, when the mapping is performed: during compilation (I guess so), during compilation or during JIT compilation in execution?
Or maybe this is all wrong: string and String are not the same thing in C# so there are some situations where they cannot be interchanged

I have a simple class that essentially just holds some values. I have overridden the `ToString()` method to return a nice string representation.

Now, I want to create a `ToXml()` method, that will return something like this:

    &lt;Song&gt;
        &lt;Artist&gt;Bla&lt;/Artist&gt;
        &lt;Title&gt;Foo&lt;/Title&gt;
    &lt;/Song&gt;

Of course, I could just use a `StringBuilder` here, but I would like to return an `XmlNode` or `XmlElement`, to be used with `XmlDocument.AppendChild`.

I do not seem to be able to create an `XmlElement` other than calling `XmlDocument.CreateElement`, so I wonder if I have just overlooked anything, or if I really either have to pass in either a `XmlDocument` or `ref XmlElement` to work with, or have the function return a String that contains the XML I want?


Creating an XmlNode/XmlElement in C# without an XmlDocument?

Background: Over the next month, I&#39;ll be giving three talks about or at least including `LINQ` in the context of `C#`. I&#39;d like to know which topics are worth giving a fair amount of attention to, based on what people may find hard to understand, or what they may have a mistaken impression of. I won&#39;t be specifically talking about `LINQ` to `SQL` or the Entity Framework except as examples of how queries can be executed remotely using expression trees (and usually `IQueryable`).

So, what have you found hard about `LINQ`? What have you seen in terms of misunderstandings? Examples might be any of the following, but please don&#39;t limit yourself!

  - How the `C#` compiler treats query expressions
  - Lambda expressions
  - Expression trees
  - Extension methods
  - Anonymous types
  - `IQueryable`
  - Deferred vs immediate execution
  - Streaming vs buffered execution (e.g. OrderBy is deferred but buffered)
  - Implicitly typed local variables
  - Reading complex generic signatures (e.g. [Enumerable.Join][1])


  [1]: http://msdn.microsoft.com/en-us/library/bb549267.aspx

What&#39;s the hardest or most misunderstood aspect of LINQ?

What is the most efficient way to write the old-school:

    StringBuilder sb = new StringBuilder();
    if (strings.Count &gt; 0)
    {
    	foreach (string s in strings)
    	{
    	    sb.Append(s + &quot;, &quot;);
    	}
    	sb.Remove(sb.Length - 2, 2);
    }
    return sb.ToString();

...in LINQ?

Using LINQ to concatenate strings

Is there any class in the .NET framework that can read/write standard .ini files:

    [Section]
    &lt;keyname&gt;=&lt;value&gt;
    ...


Delphi has the `TIniFile` component and I want to know if there is anything similar for C#? 


Reading/writing an INI file

Is there a way to Deserialize Expressions in C#, I would like to store Expressions in a Database and load them at run time.


Serializing and Deserializing Expression Trees in C#

It&#39;s been said on the blogosphere and by Microsoft themselves that MEF isn&#39;t another IoC container.

OK...but why? It seems the same to me. Maybe it&#39;s not as good as Unity or [Castle Windsor][1], but it still fits the definition, doesn&#39;t it?

Why isn&#39;t MEF an IoC Container like Unity or Castle Windsor?

  [1]: https://en.wikipedia.org/wiki/Castle_Project#Features


Why exactly isn&#39;t MEF a DI/IoC container?

I&#39;m using Entity Framework O/R mapper from Microsoft and using entity classes (generated classes that are mapped to DB objects) as a business objects. 
Is this OK? Please state your cons or pros. What to do in a case of WCF communication between business layer and presentation, how to send those objects as data members?


Using Entity Framework entities as business objects?

Is there a class in the standard library of .NET that gives me the functionality to create random variables that follow Gaussian distribution? 


Random Gaussian Variables

If I need to throw an exception from within my application which of the built-in .NET exception classes can I use? Are they all fair game? When should I derive my own?

Which built-in .NET exceptions can I throw from my application?

I&#39;m trying to create a *fast* 2D point inside polygon algorithm, for use in hit-testing (e.g. `Polygon.contains(p:Point)`). Suggestions for effective techniques would be appreciated.

How can I determine whether a 2D Point is within a Polygon?

If I switch on the generating of debug info with Javac then the class files are 20-25% larger. Has this any performance effects on running the Java program? If yes on which conditions and how many. I expect a little impact on loading the classes because the files are larger but this should be minimal.

Is there a performance difference between Javac debug on and off?

I love programming with and for Windows Presentation Framework. Mostly I write browser-like apps using WPF and XAML.

But what really annoys me is the slowness of WPF. A simple page with only a few controls loads fast enough, but as soon as a page is a teeny weeny bit more complex, like containing a lot of data entry fields, one or two tab controls, and stuff, it gets painful.

Loading of such a page can take more than one second. Seconds, indeed, especially on not so fast computers (read: the customers computers) it can take ages.

Same with changing values on the page. Everything about the WPF UI is somehow sluggy.

This is so mean! They give me this beautiful framework, but make it so excruciatingly slow so I&#39;ll have to apologize to our customers all the time!

My Question: 

 1. How do you speed up WPF?
 2. How do you profile bottlenecks?
 3. How do you deal with the slowness?

Since this seems to be an universal problem with WPF, I&#39;m looking for general advice, useful for many situations and problems.

Some other related questions:

- [What tools do you use for WPF development][103]
- [Tools to develop WPF or Silverlight applications][104]

   [103]: https://stackoverflow.com/questions/38642/what-tools-do-you-use-for-wpf-development
  [104]: https://stackoverflow.com/questions/189244/tools-to-develop-wpf-or-silverlight-applications

How to speed up WPF programs?

Here&#39;s a silly fun question:

Let&#39;s say we have to perform a simple operation where we need half of the value of a variable. There are *typically* two ways of doing this:

    y = x / 2.0;
    // or...
    y = x * 0.5;

Assuming we&#39;re using the standard operators provided with the language, which one has better performance?

I&#39;m guessing multiplication is typically better so I try to stick to that when I code, but I would like to confirm this. 

Although personally I&#39;m interested in the answer for **Python** 2.4-2.5, feel free to also post an answer for other languages! And if you&#39;d like, feel free to post other fancier ways (like using bitwise shift operators) as well.

Should I use multiplication or division?

I&#39;ve just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this:

    public string Reverse(string text)
    {
        char[] cArray = text.ToCharArray();
        string reverse = String.Empty;
        for (int i = cArray.Length - 1; i &gt; -1; i--)
        {
            reverse += cArray[i];
        }
        return reverse;
    }
Personally I&#39;m not crazy about the function and am convinced that there&#39;s a better way to do it. Is there?


Best way to reverse a string

What&#39;s the best way to pipe the output from an java.io.OutputStream to a String in Java?

Say I have the method:

      writeToStream(Object o, OutputStream out)

Which writes certain data from the object to the given stream. However, I want to get this output into a String as easily as possible.

I&#39;m considering writing a class like this (untested):

    class StringOutputStream extends OutputStream {
    
      StringBuilder mBuf;
    
      public void write(int byte) throws IOException {
        mBuf.append((char) byte);
      }

      public String getString() {
        return mBuf.toString();
      }
    }

But is there a better way? I only want to run a test!


Get an OutputStream into a String

I want to find a linux command that can return a part of the string. In most programming languages, it&#39;s the `substr()` function. Does bash have any command that can be used for this purpose. I want to be able to do something like this...
`substr &quot;abcdefg&quot; 2 3` - prints `cde`.


----------
Subsequent similar question:

* [https://stackoverflow.com/questions/428109/extract-substring-in-bash][1]


  [1]: https://stackoverflow.com/questions/428109/extract-substring-in-bash

What linux shell command returns a part of a string?

What is the Perl equivalent of `strlen()`?

How do I get the length of a string in Perl?

I have a string.

    string strToProcess = &quot;fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@&quot;;

I need to add a newline after every occurence of &quot;@&quot; symbol in the string.

My Output should be like this

    fkdfdsfdflkdkfk@
    dfsdfjk72388389@
    kdkfkdfkkl@
    jkdjkfjd@
    jjjk@

Adding a newline into a string in C#

What regex pattern would need I to pass to  `java.lang.String.split()`  to split a String into an Array of substrings using all whitespace characters (`&#39; &#39;`, `&#39;\t&#39;`, `&#39;\n&#39;`, etc.) as delimiters?

How to split a string with any whitespace chars as delimiters

This seems like a simple question, but I can&#39;t find it with the Stack Overflow search or Google. What does a type followed by a `_t` mean? Such as

    int_t anInt;
I see it a lot in C code meant to deal closely with hardware—I can&#39;t help but think that they&#39;re related.

What does a type followed by _t (underscore-t) represent?

I&#39;m not sure how password hashing works (will be implementing it later), but need to create database schema now.

I&#39;m thinking of limiting passwords to 4-20 characters, but as I understand after encrypting hash string will be of different length.

So, how to store these passwords in the database?

What data type to use for hashed password field and what length?

Which sql data type should we use for number bases primary key:

1. int
2. bigint
3. numeric
4. float

Sql Data Type for Primary Key - SQL Server?

I&#39;ve always wondered why the C++ Standard library has instantiated basic_[io]stream and all its variants using the &lt;code&gt;char&lt;/code&gt; type instead of the &lt;code&gt;unsigned char&lt;/code&gt; type. &lt;code&gt;char&lt;/code&gt; means (depending on whether it is signed or not) you can have overflow and underflow for operations like get(), which will lead to implementation-defined value of the variables involved. Another example is when you want to output a byte, unformatted, to an ostream using its `put` function.

Any ideas?

----------
**Note**: I&#39;m still not really convinced. So if you know the definitive answer, you can still post it indeed.

Why do C++ streams use char instead of unsigned char?

What is the difference between HTML `&lt;input type=&#39;button&#39; /&gt;` and `&lt;input type=&#39;submit&#39; /&gt;`?

String vs string in C#

C# Problem Overview

C# Solutions

How do I drag and drop files into an application?

'POCO' definition

Attributions