Take a look at this one [http://qrcodenet.codeplex.com/][1]


  [1]: http://qrcodenet.codeplex.com/

http://code.google.com/p/zxing/ and https://stackoverflow.com/questions/1655953/how-to-use-zxing-c-port might answer your question.

I have been using the other port [ZXing.Net][1] with some success. According to the website, it has assemblies available for the following platforms: 

&gt; - .Net 2.0, 3.5 and 4.0
&gt; - Silverlight 4 and 5
&gt; - Windows Phone 7.0, 7.1 and 8.0
&gt; - Windows CE
&gt; - Windows RT
&gt; - Unity3D (.Net 2.0 built without System.Drawing reference)
&gt; - Mono for Android



  [1]: http://zxingnet.codeplex.com/

In past I used [this one][1].&lt;br /&gt;
It&#39;s really &quot;heavy&quot; (about 6MB) but it worked for me and it&#39;s released under Code Project Open License (CPOL). I forgot: C# source code is provided.&lt;br /&gt;
Another one is [MessagingToolKit][2], which is provided even with a free license; I don&#39;t remember (excuse me) if QR is inside free license or not.


  [1]: http://www.codeproject.com/KB/cs/qrcode.aspx
  [2]: http://twit88.com/platform/projects/show/messagingtoolkit

In my view I have the following element

      @Html.PasswordFor(model =&gt; model.Password)

This is on a screen that creates/updates user details. When I am trying to update the user this field remains blank. When I change this element to a TextBoxFor it gets the data. How do I get to populate the Password field.

ASP.Net MVC3 Html.PasswordFor does not populate

When measuring elapsed time on a low level, I have the choice of using any of these:

    System.currentTimeMillis();
    System.nanoTime();

Both methods are implemented `native`. Before digging into any C code, does anyone know if there is any substantial overhead calling one or the other? I mean, if I don&#39;t really care about the extra precision, which one would be expected to be less CPU time consuming?

N.B: I&#39;m using the standard Java 1.6 JDK, but the question may be valid for any JRE...

Time measuring overhead in Java

I&#39;m looking for a library to generate QR codes in .NET I&#39;ve stumbled across a few paid ones, but very few free ones that look any good. Anyone have experience with a good free open-source library?

Thanks

What open-source QR Code Generator would you recommend?

<p>I'm looking for a library to generate QR codes in .NET I've stumbled across a few paid ones, but very few free ones that look any good. Anyone have experience with a good free open-source library?</p>
<p>Thanks</p>


How do I convert a `Color` to a `Brush` in C#?

convert from Color to brush

Does anyone here have experience with/in developing IE extensions that can share their knowledge? This would include code samples, or links to good ones, or documentation on the process, or anything.

I really want to do this, but I&#39;m hitting a giant wall with lousy documentation, lousy code/example code/lack thereof. Any help/resources you could offer would be greatly appreciated.

Specifically, I would like to start with how to get access to/manipulate the DOM from within a IE extension. 

EDIT, even more details:

Ideally, I would like to plant a toolbar button that, when clicked, popped a menu up that contains links to external sites. I would also like to access the DOM and plant JavaScript on the page depending on some conditions. 

What is the best way to persist information in an IE extension? In Firefox/Chrome/Most modern browsers, you use `window.localStorage`, but obviously with IE8/IE7, that&#39;s not an option. Maybe a SQLite DB or such? It is okay to assume that .NET 4.0 will be installed on a user&#39;s computer?

I don&#39;t want to use Spice IE as I want to build one that is compatible with IE9 as well. I&#39;ve added the C++ tag to this question as well, because if it&#39;s better to build one in C++, I can do that. 

How to get started with developing Internet Explorer extensions?

I examine the properties of an object via reflection and continue processing the data type of each property. Here is my (reduced) source:

    private void ExamineObject(object o)
    {
      Type type = default(Type);
      Type propertyType = default(Type);
      PropertyInfo[] propertyInfo = null;

      type = o.GetType();

      propertyInfo = type.GetProperties(BindingFlags.GetProperty |
                                        BindingFlags.Public |
                                        BindingFlags.NonPublic |
                                        BindingFlags.Instance);
      // Loop over all properties
      for (int propertyInfoIndex = 0; propertyInfoIndex &lt;= propertyInfo.Length - 1; propertyInfoIndex++)
      {
        propertyType = propertyInfo[propertyInfoIndex].PropertyType;
      }
    }

My problem is, that I newly need to handle nullable properties, but I have no clue how to get the type of a nullable property.

Find type of nullable properties via reflection

I want to use a nlogger in my application, maybe in the future I will need to change the logging system.
So I want to use a logging facade.

Do you know any recommendations for existing examples how to write those ones ?
Or just give me link to some best practice in this area.

Logger wrapper best practice

I&#39;m working with VS2010 express on Win7 (64 bit) and I&#39;m trying use `System.ServiceModel` but I get an error that there is no `ServiceModel` in the `System` namespace:

&gt; The type or namespace name &#39;ServiceModel&#39; does not exist in the namespace &#39;System&#39; (are you missing an assembly reference?)

I looked in `\Windows\Microsoft.NET\Framework\v4.0.30319` and there are some `ServiceModel___.dll` files but I don&#39;t know if I&#39;m missing something or if they are corrupted.

Any advice?

Thanks,
Yonatan

System.ServiceModel missing

I have noticed more and more a growing number of resources for developing applications using the F# programming language and the question came to mind of what the F# language was created to accomplish. Is it made for a specific platform, for example, Desktop, Mobile Devices, Web Applications? Also, did it include features not available in other programming languages that are currently available for developing .NET applications? Also is it still possible to create applications for the desktop, mobile, and web using F# as we can use VB or C#? Also, are there other languages similar to F# that I can use to cross-check against to get a better understanding of how functional programming works?

What is the F# language created to accomplish?

I need to drop an image file into my WPF application. I currently have a event firing when I drop the files in, but I don&#39;t know how what to do next. How do I get the Image? Is the `sender` object the image or the control?

    private void ImagePanel_Drop(object sender, DragEventArgs e)
    {
        //what next, dont know how to get the image object, can I get the file path here?
    }





Drag and drop files into WPF

I&#39;m using Entity Framework 4 with the Model First approach.

I started the project, designed the entities and generated the database. Everything worked fine.

Then I needed to go back and add another entity to my model. However, as I drag an entity to the EDMX I get this error:

![enter image description here][1]

Alright! I just need to map Entity1 to a table.. But hey! I&#39;m using Model First approach, I expect it to create the table for me when I generate the DDL.

How do I work around this error?


  [1]: http://i.stack.imgur.com/9vis8.png

Why am I getting this error: No mapping specified for the following EntitySet/AssociationSet - Entity1?

What are some open source programs that use Haskell and can be considered to be _good quality modern Haskell_? The larger the code base, the better.

I want to learn from their source code. I feel I&#39;m past the point of learning from small code examples, which are often to esoteric and small-world. I want to see how code is structured, how monads interact when you have a lot of things going on (logging, I/O, configuration, etc.).


Good Haskell source to read and learn from

What&#39;s the recommended way/workflow of contacting the R Core Team in order to propose feature requests?

By &quot;feature requests&quot; I do not simply mean firing something like &quot;I&#39;d like to see functionality XY doing XY, so it&#39;d be cool if you&#39;d go ahead and implement that for me&quot; but proposing actual code instead.

I love R and am willing to contribute, share code and all. Yet sometimes I find it a bit hard to figure out just exactly ***how*** to contribute ;-) I&#39;ve looked at the [R Project Developer Page][1] and used the r-devel mailing list a couple of times. Especially with respect to the latter, I&#39;ve gotten the impression that it&#39;s not the right place / not desired to elaborate one&#39;s feature request with actual code (which can sometimes be more than just a two liner). So I wonder if there&#39;s a &quot;better&quot; or more &quot;systematical&quot; way in order to do that.

EDIT 2011-11-09
---------------

I was asked to provide a short example:

I&#39;m using S4 Reference Classes extensively and implemented a lot of little utility functions for my objects. One such utility function is some sort of a &quot;reset&quot; functionality:

    setRefClass(
        &quot;A&quot;, 
        fields=list(a=&quot;numeric&quot;, b=&quot;character&quot;),
        methods=list(
            reset=function(fields=NULL, ...){
                temp &lt;- new(&quot;A&quot;)
                if(is.null(fields)){
                    fields &lt;- names(getRefClass(&quot;A&quot;)$fields())
                }
                sapply(fields, function(x){
                    .self$field(name=x, value=temp$field(x))        
                })
                return(TRUE)
            }
        )
    )
    
    x &lt;- new(&quot;A&quot;, a=1:10, b=letters[1:10])
    
    x$a
    x$b
    x$reset(fields=&quot;a&quot;)
    
    x$a
    x$b
    
    x$reset()
    x$a
    x$b

Quite often, it&#39;s not the fanciest feature in the world that pops up on my &quot;oh, that&#39;s missing&quot; list. Plus it might be such a &quot;singular&quot; function that developing a whole package sometimes feels like cracking the nut with a sledgehammer.

  [1]: http://developer.r-project.org/
  [2]: http://cran.at.r-project.org/web/packages/available_packages_by_name.html
  [3]: http://cran.at.r-project.org/web/packages/RMySQL/index.html
  [4]: http://cran.at.r-project.org/web/packages/RSQLite/index.html
  [5]: http://cran.at.r-project.org/web/packages/RMongo/index.html
  [6]: http://cran.at.r-project.org/web/packages/RMySQL/index.html
  [7]: http://cran.at.r-project.org/web/packages/forecast/index.html
  [8]: http://cran.at.r-project.org/web/packages/R.utils/index.html

Proposing feature requests to the R Core Team

I have read on the web that following combination exists : 

**Proprietary Source code + GPL Source code** - &gt; GPL Source code ( All code has to be released under GPL)

**Proprietary Source code + LGPL Source code** - &gt; Proprietary Source code ( All code remains Proprietary )

Now how does **statically/Dynamically** linking GPL and LGPL code works with the above combination?

GPL/LGPL and Static Linking

Here&#39;s what I really want: a site collecting re-usable components for Android.

I have found various [small][1] [lists][2], the biggest being the [Open Intents](http://www.openintents.org/en/libraries) library list. Mark Murphy (hi, Mark) also lists the library projects he publishes.

None of this is of the same order as, say [Cocoa Controls][3] or [Cocoa Objects][4].

Where do you go to grab re-usable libraries for Android?

**Edit**: this isn&#39;t just about library projects, though this would be ideal. On the flip side: where do I publish my open-sourced library projects, over and above just &quot;Github&quot;.

  [1]: http://androidcontrols.org/controls
  [2]: http://android-libraries.com/
  [3]: http://cocoacontrols.com/controls?sort=rating
  [4]: http://cocoaobjects.com

Open source Android libraries? Reusable Views, ViewGroups, Adapters etc?

I need to integrate VoIP service in my Android application.&lt;br&gt;
Is there any free (best open source) library ?

I need that the library at least allows voice call over internet and not necessarily internet to phone (like 2 Skype account).

VoIP library for Android

I&#39;m trying to generate QR codes on my website. All they have to do is have a URL in them, which a variable on my site will provide. What would be the easiest way to do this?

Dynamically generating a QR code with PHP

I&#39;m looking for a free to use c# library/code to create barcodes. Secifically I need to be able to create QR-Code type barcodes. I&#39;m looking for free to use (Open Source or just Free, etc.) not pay to use.

Free c# QR-Code generator

I need to create a qrcode in my android application, and I need a library or source code that lets me create a QR Code in an Android app.

The library I need must:

 1. not leave a watermark (like `onbarcode` library)
 2. not use web service API to create the qrcode (like Google&#39;s library zxing)
 3. not need 3rd party installers (like QR Droid)

I already created such code for iPhone (Objective-C) but I need a quick fix for Android until I have time to make a QR Code generator of my own. It&#39;s my first android project so any help will be appreciated.

How to generate a QR Code for an Android application?

In my application I need to read Qr code. I searched the net and found Zing codes however lots of developers had problem with using it and it seems it is buggy!

If i assume that my customers has qr reader installed on their device, how can i use those applications and call them via implicit intents? 

if user doesn&#39;t have any qr reader, what will happen to the application? if it crashes, may i ask user to download for example QrDroid and after that use it?

Android, How to read QR code in my application?

I would like to use this script https://github.com/jeromeetienne/jquery-qrcode&lt;br/&gt;
(or is there even a better solution?)

What I like to do is &quot;save&quot; some small scripts or programs and even files like xml formatted files (svg, x3d, ...) as QR code images.

But how much information (in bytes) can I save exactly to QR code images (using this javascript solution)? 

Any experience with this script and using qr codes for files?&lt;br/&gt;
https://github.com/jeromeetienne/jquery-qrcode

Content Type	Original Author	Original Content on Stackoverflow
Question	Micah	View Question on Stackoverflow
Solution 1 - C#	George Mamaladze	View Answer on Stackoverflow
Solution 2 - C#	Michael Levy	View Answer on Stackoverflow
Solution 3 - C#	tobsen	View Answer on Stackoverflow
Solution 4 - C#	Marco	View Answer on Stackoverflow

What open-source QR Code Generator would you recommend?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Time measuring overhead in Java

ASP.Net MVC3 Html.PasswordFor does not populate

Attributions