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Awesome question and answers too.
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Hi<br />
<br />
You can try some of nuget packages.<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/11_w49/1042581/MVCEXcel.png" target="_blank" title="Nuget result (52 KB)"><img alt="Nuget result" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2015/11_w49/800_1042581/MVCEXcel.png" /></a>
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MVCEXcel.png

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I need to edit Excell in browser. <br />
<br />
I found Office Web Component 2003, anyone know if there is another componet more new to use with MVC?<br />
<br />
It need to be 100% free.
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I need to edit Excell in browser. 

I found Office Web Component 2003, anyone know if there is another componet more new to use with MVC?

It need to be 100% free.

Office Web Component

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications