This post shows how to import and export .xls or .xlsx (Excel files) in ASP.NET Core. And when thinking about dealing with excel with .NET, we always look for third-party libraries or component. And one of the most popular .net library that reads and writes Excel 2007/2010 files using the Open Office Xml format (xlsx) is EPPlus. However, at the time of writing this post, this library is not updated to support .NET Core. But there exists an unofficial version of this library EPPlus.Core which can do the job of import and export xlsx in ASP.NET Core. This works on Windows, Linux and Mac. 

These are the customer-reported issues addressed in 15.9.2:

• MFC EXE (binary) size is 5 times bigger in VS 15.8 (_MSC_VER = 1915).
• Key 'OPENSSH' is not supported.
• Windows magnifier can no longer track keyboad cursor.
• Analysis fails with immediately-invoked lamba in while loop.
• Xamarin iOS designer not working with 15.9 and Xamarin.iOS 12.2.1.10.
• We improved the reliability of incremental linking for large C++ projects.
• LNK2001 "unresolved external symbol" errors for certain vector deleting destructors will now be resolved.
• Compiler execution time has been improved for code that makes heavy use of chained, inline functions involving lambdas or local classes as parameter or return types. 

ReactOS is an open source alternative to the Windows operation system. Even if the first version of ReactOS dates back to 1998, there is still no 'stable' version of ReactOS. May be, the most important reason is a lack of attention

The .NET Core 2.1 RC 1 is now ready for broad testing and for production use.  

When designing web APIs, it's important to think about how the data being passed to and from the endpoint will be structured. How important is reuse in these considerations, and how much reuse can you get away with before it starts causing other problems? 

WebAssembly and Back Again: Fine-Grained Sandboxing in Firefox 95 - Mozilla Hacks - the Web developer blog 

1. Gem #1 – Expression Evaluator Format Specifiers 
   
2. Gem #2 – Controlling the value column of the debugger 
   
3. Gem #3 – Showing important values when an object is expanded 
   
4. Gem #4 – Applying view customizations to framework types 
   
5. Gem #5 – Snippets 
   
6. Gem #6 – Derived types 
   
7. Gem #7 – Find combo 
   

Why Is .NET Core Important?  

These are the customer-reported issues addressed in 15.9.5:

• VSX1000: No enough information has been provided to MSBuild in order to establish a connection to a Remote Server.
• Visual C++ 2017 Redistributable for ARM64 is not available via visualstudio.com.
• VC Runtime Redistributable Update for VS 15.9 deletes Registry Key. This fix may have an increased chance of requiring a reboot of the machine in order to install an updated VC++ Redistributable package.
• Incorrect codegen in managed c++ with List to List assignment.
• Can't connect to mac build host after Visual Studio 15.9.4 update.
• Resource directories missed in incremental builds with AndroidAarLibrary items.
• Lots of external assembly references - JNI ERROR (app bug): local reference table overflow (max=512).
• The Unity Editor has been updated to 2018.3. For more information, please visit the Unity website.
• SSDT: We enabled SQL projects to build schemas that have non-clustered columnstore indexes on an indexed views.
• SSDT: We fixed a significant performance issue in the schema compare tool when generating a script.
• SSDT: We fixed the schema drift detection logic in the schema compare tool which forced a new comparison to reenable scripting and publishing actions.

Security Advisory Notices

• A remote code execution vulnerability exists in Visual Studio when the C++ compiler improperly handles specific combinations of C++ constructs.