The anti-forgery token could not be decrypted. 
If this application is hosted by a Web Farm or cluster,
ensure that all machines are running the same version of ASP.NET Web Pages and
that the <machineKey> configuration specifies explicit encryption and validation keys. 
AutoGenerate cannot be used in a cluster

Description: An unhandled exception occurred during the execution of the current web request. 
Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.Mvc.HttpAntiForgeryException: 
The anti-forgery token could not be decrypted.
If this application is hosted by a Web Farm or cluster, 
ensure that all machines are running the same version of ASP.NET Web Pages and that the <machineKey> configuration 
specifies explicit encryption and validation keys. AutoGenerate cannot be used in a cluster.

<system.web>
  <machineKey validationKey="mykey" decryptionKey="myotherkey" validation="SHA1" decryption="AES" />
</system.web>

This is a list of features we have looked at for C# 7, roughly categorized according to our current level of interest and estimated plausibility.

In the same time when first object-oriented languages were emerging, another concept inspired by general relativity and quantum mechanics was taking shape – actor model. In general terms, the Actor model was defined 1973. and was developed on a platform of multiple independent processors in a network. Similar to the object-oriented approach, this essentially mathematical model, revolved around the concept of actors. An actor is the smallest structural unit of Actor model, and just like objects, they encapsulate data and behavior. In difference to objects, however, actors communicate with each other exclusively trough messages. Messages in actors are processed in a serial manner. According to the full definition of actors, they can do three things:

• send a finite number of messages to other actors
  
• create a finite number of new actors
  
• designate the behavior to be used for the next message it receives 
  

GitHub Issues

The GitHub Issues integration allows you to search and reference your issues from the commit message box in VS, in response to this suggestion ticket. You can reference an issue or a pull request by typing # or clicking on the # button in the lower right side of the commit message text box. If you weren't already authenticated to access related issues, you will now be prompted to sign in to take advantage of this feature.

Line Unstaging

To continue improving our line-staging (aka interactive staging) feature, we've added unstage. You can now use the tool tip option to unstage changes, line by line, as requested here Unstage individual lines and hunks in a file - 4 votes

Arm64

We continue to build native support for Arm64 on Windows 11 for the most popular developer scenarios. We now support the .NET Multi-platform App UI (MAUI) workload on Arm64 Visual Studio.

C++

• Available as a preview feature, you can now view Unreal Engine logs without leaving VS. To see the logs from the Unreal Engine Editor, click View > Other Windows > UE Log. To filter your logs, click on the "Categories" or "Verbosity" dropdowns. Since this is an experimental feature, feedback is greatly appreciated.
• You can now import STM32CubeIDE projects for embedded development within Visual Studio with File > Open > Import STM32CubeIDE project. This generates a CMake project with device flashing and debugging settings for STLink. You must have the STM32CubeIDE installed with the board support package for your device. More details available here.
• You can use the new CMake Debugger to debug your CMake scripts at build time. You can set breakpoints based on filenames, line numbers, and when CMake errors are triggered. Additionally, you can view call stacks of filenames and watch defined variables. Currently, this only works with bundled CMake, and projects targeting WSL or remote machines are not supported yet. We are actively working to add more support to the CMake debugger, and feedback is greatly appreciated. 

.NET Memory Performance Analysis
Know when to worry about it, and what to do if you need to worry about it 

Columnstore indexes were first introduced in SQL Server 2012. They are a new way to store the data from a table that improves the performance of certain query types by at least ten times. They are especially helpful with fact tables in data warehouses. 

Anders Hejlsberg has been working on interesting new type system capabilities: template string types as well as mapped type as clauses. Both features are slated for the upcoming TypeScript 4.1 release. 

Among the new features for version 1.3 are:

• new validators pipeline
• asynchronous custom validators
• model data binding options
• ngMessages module for error message reuse
• one-time data binding support 

The new sha1(X) function computes the SHA1 hash of the input X, or NULL if X is NULL, while the sha1_query(Y) function evalutes all queries in the SQL statements of Y and returns a hash of their results. 

Issues Fixed in 15.9.12

These are the customer-reported issues addressed in 15.9.12:

• Access violation C++ /CLI 15.9.5 ISO C++ Latest Draft Standard since 15.9.5.
• An error occurred loading this property page (CSS & JSON).
• Visual Studio 2017 crashing when editing package.json.
• Opening package.json locks up Visual Studio.
• PGO Code Gen Bug - Vectorized instruction accessing memory OOB.
• Bad code gen in recursive bucket split routine.
• Compiler optimization bug in 15.8.9.
• We have fixed a linker error LNK4020 when using PCH, /Zi, and /GL in distributed build systems, such as IncrediBuild. The C++ compiler backend now correctly associates CIL OBJs with their corresponding compiler generated PDB when generating debug info for cross-module inlining.

Security Advisory Notices

• Diagnostics Hub Standard Collector Vulnerability