QR Code reader in webpage [closed] - c#

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I'm looking for a way to make something very similar to this http://blog.jactionscripters.com/2009/05/23/introduction-of-qr-code-reader-library/ on my asp MVC 3 project. It is a QR Code Reader, not generator. I want it to be displayed on a View and serve as an input.
Could anybody point me in the right direction to do this? Any links or library info would be appreciated.

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Downloading files via button with c# [closed]

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I'm making an application with c#, but I'm not very knowledgeable, it needs to download something via the button
I'm making a folder download program with c#, thanks to the program, I can download folders.

Save Screenshot to specified directory when a button is clicked [closed]

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I am looking to make a small windows utility that will let the user browse to a file directory. Is there a good C# method (Windows) to execute this?
If you are using WinForms, you want FolderBrowserDialog.
See here: https://msdn.microsoft.com/en-us/library/system.windows.forms.folderbrowserdialog(v=vs.110).aspx

Linking c++ dlib project to c# [closed]

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I have a project "Implementation of cca" using dlib library c++, on the other hand, I have a project which used c#.
Actually, I have no idea how to link them.
Please can you help me
Use the System.Runtime.InteropServices-namespace like described here: https://msdn.microsoft.com/en-us/library/ms235282.aspx
Good examples are http://www.dotnetperls.com/dllimport or https://drthitirat.wordpress.com/2013/05/30/combine-gui-of-c-with-c-codes/

Implementation of pay-wall in .net MVC 4 application [closed]

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I am trying to implement pay-wall mechanism in my MVC 4 application.
The requirement is to restrict access to some pages of a PDF file in preview mode and allow the complete file to display after pay-wall subscription.
i searched some links but they are providing only theoretical information about pay-wall.
Please suggest some link or examples for implementing it.
Any kind of help will be appreciated.
Thanks in advance.

State view and application view asp.net c# [closed]

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Can you give some links whit, code examples, what is State view and application view for beginners to better understand ?
http://www.w3schools.com/aspnet/aspnet_viewstate.asp
http://asp.net-tutorials.com/state/viewstate/

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