Attempting to install or uninstall results in the error "Cannot create a file when that file already exists.”
For some reason, Visual Studio extensions can get in a weird state where you've uninstalled the VSIX extension, but some files were left behind. To work around this issue:

1. Exit Visual Studio
2. Open the following folder (it might be on a different drive on your machine)
    C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\Extensions\Microsoft Corporation\NuGet Package Manager\<version>\
3. Delete all the files with the .deleteme extensions.
4. Re-open Visual Studio
After following these steps, you should be able to continue.

How to store JSON data in Windows Phone 8  

A guide to building your first Windows app 

Welcome to EntityFrameworkTutorial.net. Here you will learn everything about Entity Framework in easy steps. It covers basic to expert level tutorials for all the features of Entity Framework with code snippets. Readers can also download sample project and the School database used in various tutorials. 

 React Native for Android has been released by Facebook, providing Android developers with a way to create apps in JavaScript. 

thanks to a new feature added in Visual Studio 2019 16.1, we can combine the best of both worlds when it comes to support the App Installer technology: the easiness of automatically generating an .appinstaller file as part of the package creation process and the flexibility of the new update features added in Windows 10 1903. 

.NET apps can now run natively on Windows ARM64. This follows the support we added for Linux ARM64 in .NET Core 3.0. With .NET 5.0, you can develop web and UI apps on Windows ARM64 devices, and deliver your applications to users who own Surface Pro X and similar devices. You can already run .NET Core and .NET Framework apps on Windows ARM64, but via x86 emulation. It’s workable, but native ARM64 execution has much better performance. 

راه‌های گفته شده را امتحان کردم نشد و سپس با جستجوی بیشتر  متوجه شدم باید دستور زیر را به .csproject برنامه اضافه کرد و بعد دوباره پابلیش کردم و مشکل بر طرف شد. اما این روش در هنگام پابلیش فایل‌های بیشتری تولید می‌کند و پروژه را سنگین می‌کند. آیا راه حل دیگری برای این پیغام بالا وجود دارد ؟

This release contains the following improvements and enhancements:

• This release now installs Java™ Development Kit 8, Update 181 (JDK version 8u181). 

These are the customer-reported issues addressed in 15.7.6:

• Visual C++ Redistributable 2017 does not report the install state in a specific registry location.
• In 15.7 users may see extensions load without all of their assets and cause VS to crash. This has been addressed for 15.7.6.
• Visual Studio 2017 version 15.7.5 crashes when opening a solution. 

Learn Minimal APIs in .NET 7
Learn how to build Minimal APIs in .NET 7 with hands-on course. By the end of the course, you will be able to build well-constructed Minimal API Endpoints using C#, .NET7, and Swagger.

⭐️ Contents ⭐️
⌨️ (0:00:00) Introduction
⌨️ (0:01:30) Topics Covered
⌨️ (0:02:47) Why Minimal API?
⌨️ (0:06:07) Create Project
⌨️ (0:07:57) Comparing Files Minimal vs Standard
⌨️ (0:11:05) Program file changes
⌨️ (0:13:50) Clean Program class file
⌨️ (0:16:02) API Basics
⌨️ (0:16:44) What is API?
⌨️ (0:21:11) Request and response
⌨️ (0:25:59) Request Object
⌨️ (0:30:12) Response Object
⌨️ (0:35:36) httpverb
⌨️ (0:40:38) Create First Endpoint
⌨️ (0:43:43) Return Types
⌨️ (0:46:15) Route Parameters
⌨️ (0:48:29) Create Coupon Model and Coupon Store
⌨️ (0:51:38) Get All Endpoint
⌨️ (0:53:09) Get Individual Coupon
⌨️ (0:55:19) Create Coupon
⌨️ (0:59:53) Name Endpoints
⌨️ (1:03:17) Products and Accepts in Minimal API
⌨️ (1:06:58) Dependency Injection in Minimal API
⌨️ (1:10:25) Add DTOs
⌨️ (1:13:56) AutoMapper and Dependency Injection
⌨️ (1:18:32) Fluent Validators
⌨️ (1:24:07) Async Endpoints
⌨️ (1:26:11) API Response
⌨️ (1:32:57) Assignment - Put and Delete
⌨️ (1:33:49) Assignment Solution - Put and Delete Endpoints