How to extract .dll file in c#? [closed] - c#

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I am new to .NET application development. Involving one project, there are three modules like Interface layer, Business layer, and Data layer; I built these and I got .dll file.
But I lost the source code of one .dll file.
I'd like to extract the .dll and get the same source code. Is it possible to extract my source code from the .dll file?

I really like JetBrains dotPeek, it's free and easy to use.
Used it for same purposes

Try ILSpy, an open-source .NET assembly browser and decompiler (it requires the .NET Framework 4.0).

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.Net tools for decompiling [closed]

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Closed 8 years ago.
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Are there API tools within the core .Net framework (any version) which help in decompiling code?
Note: I am not looking for an external tool (such as reflector or dotPeek), I am coming from the direction of trying to build an external tool.
If you are looking for a decompiler with public source code, I believe ILSpy is what you are looking for.
ILSpy is an open source decompiler and you can download the entire Solution from the project's GitHub.

Math Expression Evaluator for Portable Class Library Project [closed]

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I am currently using ILCalc to parse and evaluate mathematical expressions with variables in my .NET and Windows Phone library which uses shared sources files (via symbolic link) to achieve cross-project type functionality.
I would like to replace that brittle linking mechanism with a Portable Class Library version (which alleviates the need to have 2 separate projects with shared files). However, the ILCalc source (stable but not updated since 2010) uses methods that are not available to PCL projects (e.g., DynamicMethod).
Can anyone point me to a Portable Class Library project that provides mathematical expression evaluation with variables (e.g. 2*x + 5, where 'x' is a variable who's value is provided at runtime)?
Try this one, hope it suits you
http://mathosparser.codeplex.com

Twain or WIA? A bit lost between this two interface [closed]

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I need to write a c# assembly (DLL) in order to scan documents.
I don't know if I need to use TWAIN or WIA.
Anyone could help me please ?
What are the différences?
What are your advices ?
Is there a c# Library ?
Generally, if your application is to interact with scanners, TWAIN is recommended. While for cameras, WIA offers better support.
So for document scanning solution, I would recommend TWAIN.
TWAIN.H file is a C/C++ header file. If you want to code it to .NET yourself, you can refer to this post to get some resources:
Using TWAIN in .NET - Looking for resources
Or you can use a commercial .NET TWAIN component.

C# opensource djvu library [closed]

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Do you know any opensource libraries for DJVU? I can't find anything useful.
One of the most rated DjVU library is here:
DjVuLibre
However is in C++.
I created an open source Djvu library which is written in C#. It needs to be optimized a bit, but is fully usable. https://github.com/Telavian/DjvuNet
As for open source DjVuLibre mentioned by Steve, you could find some pointers how to use it from .NET here - Creating simple c++.net wrapper. Step-by-step
As for paid libraries - you could look at: Caminova DjVu SDK for .NET Framework. This is not too expensive.

License key library for C# windows application that is open source / free [closed]

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Any recommendations for an open source (free) C# library/application for a C# Windows Application that could be used for: (a) creating license/product keys and (b) has library that can be used within the code to perform a check to see whether the entered license key is valid?
(I've seen other posts which cover commercial products, but here I'm looking for a ready-to-go tool with library that can be used in a C# windows application)
The .NET framework has a built-in licensing model (MSDN).
See also Applications Licensing using the .NET Framework on Developer.com
What about rhino-licensing? Here is an introductory license: Rhino Licensing

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