You'll often hear the terms framework and platform used interchangeably. This can be very confusing. You'll hear that .NET Core is a platform. Then you'll read that .NET Core is cross-platform. Next, you'll learn that .NET Core is a framework. And it doesn't help that framework is part of the name of the original full .NET Framework.

In this post, I explain the difference between frameworks and platforms and explain why sometimes you'll see .NET being referred to as a framework and other times see it referred to as a platform. 

In Visual Studio 2015 Update 2, you’ll notice that we’ve added some enhancements to previous features as well as added some new refactorings. The team focused on improving developer productivity by cutting down time, mouse-clicks, and keystrokes to make the actions you perform every day more efficient 

Summary of Notable New Features in 15.9

• You can now import and export an installation configuration file that specifies which workloads and components should be installed with an instance of Visual Studio.
• We have improved the debugging experience for NuGet packages using the new symbol package format (.snupkg).
• Step back in debugger is now available in C++ for Enterprise customers.
• C++ IntelliSense now responds to changes in the remote environment for both CMake and MSBuild projects targeting Linux.
• We have made updates to UWP Desktop Bridge framework packages and added support for ARM64 C++ Native Desktop scenarios.
• We added support for the range-v3 library with the MSVC 15.9 compiler.
• We fixed several bugs in the F# compiler and F# tools.
• Language service support for new TypeScript features for semantic file renaming and project references.
• Improved Node.js development by updating Vue.js templates and adding support for unit testing using the Jest framework.
• We added SharePoint 2019 project templates, so you can migrate existing SharePoint 2013 and 2016 projects to SharePoint 2019.
• Visual Studio Tools for Xamarin now supports Xcode 10.
• We made improvements to the Xamarin.Android build performance.
• We have added and improved features for Universal Windows Platform developers, including ARM64 support, the latest preview SDK, better debugging of Desktop Bridge applications, and XAML Designer improvements.
• Substantial improvements were made to the experience of using authenticated package feeds.
• There is now support for lock file to enable repeatable restore for PackageReference based projects.
• We have added support for the new license format for NuGet packages.
• We have introduced NuGet client policies in Visual Studio which enables you to lock down environments such that only trusted packages can be installed.
• We made the use of .NET Core within Visual Studio more predictable.

Top Issues Fixed in 15.9

• No way to change "Find All References" background color.
• "Visual C++ Resource Editor Package" load failed.
• VS2017 v15.8 Build does not start if XAML files are not manually saved first.
• Installation failed - manifest signature verification failed.
• Update 15.8.6 breaks Installer Projects.
• Scrolling up with the arrow key causes Visual Studio to page up.
• After updating to 15.8.1, data tip does not show when debugging.
• System.InvalidProgramException: Common Language Runtime detected an invalid program..
• Solution Explorer does not remain pinned after closing Visual Studio.
• Navigation bar in editor has trouble handling long method names. 

Take a break and relax

Workrave is a free program that assists in the recovery and prevention of Repetitive Strain Injury (RSI). It monitors your keyboard and mouse usage and using this information, it frequently alerts you to take microbreaks, rest breaks and restricts you to your daily computer usage. 

SQL Server and relational databases (RDBMS) have been the go-to databases for over 20 years. However, the increased need to process higher volumes and varieties of data at a rapid rate has altered the nature of data storage needs for application developers

  

Emergence.js is a lightweight, high-performance JS plugin for detecting and manipulating elements in the browser. Demo

• Dependancy-free
• IE8+ and all modern browsers
• 1KB minified and gzipped

npm install emergence.js

bower install emergence.js

Visual Studio Community 2017 RC is a free, fully featured, and extensible IDE for individual developers, open source projects, education and academic research. You can create applications for Android, iOS, Windows and the web. Integrated Azure tools make it e 

jquery.enhsplitter is a plugin to generate sliding splitters on your page. Useful for separating content, emulating the look of frames, collapsable tool windows, and more. Completely customizable look and feel, and touchscreen friendly.  Demo

ممنون از پاسخگوئیتون

مواردی رو که شما فرمودید انجام دادم( رشته اتصالی به بانک اطلاعاتی در web.config از قبل درست بود) با سه حالت مختلف 

1- فقط از متد Database.SetInitializer در روال Application_Start  استفاده کردم که با خطای زیر مواجه شدم 

3- فقط از <appSettings>  استفاده کردم که بدون هیچ خطا و هشداری بود ولی باز هم دیتابیس تشکیل نشد.