A .NET guideline specifies that an application should never throw a NullReferenceException. However, many applications and libraries do. The NullReferenceException is the most common exception happening. That’s why C# 8 tries to get rid of it. With C# 8, reference types are not null be default. This is a big change, and a great feature. However, what about all the legacy code? Can old libraries be used with C# 8 applications, and can C# 7 applications make use of C# 8 libraries?

This article demonstrates how C# 8 allows mixing old and new assemblies. 

Top Issues Fixed in Visual Studio 2019 version 16.2.5

• Visual Studio stops respsonding on creating a new SSIS project
• Fixed UI freezes occurring after extended usage of the editor.

Security Advisory Notices

CVE-2019-1232 Diagnostics Hub Standard Collector Service Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists when the Diagnostics Hub Standard Collector Service improperly impersonates certain file operations. An attacker who successfully exploited this vulnerability could gain elevated privileges. An attacker with unprivileged access to a vulnerable system could exploit this vulnerability. The security update addresses the vulnerability by ensuring the Diagnostics Hub Standard Collector Service properly impersonates file operations.

CVE-2019-1301: Denial of Service Vulnerability in .NET Core

A denial of service vulnerability exists when .NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core web application. The vulnerability can be exploited remotely, without authentication.

The update addresses the vulnerability by correcting how the .NET Core web application handles web requests.

 Blazor is the new Microsoft experimental framework that brings C# into any browser without a plug-in. It holds the promise of modern single-page applications, combined with the ability to use C# and its vast base-class library. Blazor takes C# development to a new level. It’s the final piece necessary to make the language a full-stack development tool. It will have all the power of the popular JavaScript frameworks, but based on the familiar languages, APIs and tooling of the Microsoft .NET Framework. 

Security Advisory Notices

CVE-2019-1077 Visual Studio Extension Auto Update Vulnerability

An elevation of privilege vulnerability exists when the Visual Studio Extension auto-update process improperly performs certain file operations. An attacker who successfully exploited this vulnerability could delete files in arbitrary locations. To exploit this vulnerability, an attacker would require unprivileged access to a vulnerable system. The security update addresses the vulnerability by securing locations the Visual Studio Extension auto-update performs file operations in.

CVE-2019-1075 ASP.NET Core Spoofing Vulnerability

A spoofing vulnerability exists in ASP.NET Core that could lead to an open redirect. An attacker who successfully exploited the vulnerability could redirect a targeted user to a malicious website. To exploit the vulnerability, an attacker could send a link that has a specially crafted URL and convince the user to click the link.

The security update addresses the vulnerability by correcting how ASP.NET Core parses URLs. Details can be found in the .NET Core release notes.

CVE-2019-1113 WorkflowDesigner XOML deserialization allows code execution

A XOML file referencing certain types could cause random code to be executed when the XOML file is opened in Visual Studio. There is now a restriction on what types are allowed to be used in XOML files. If a XOML file containing one of the newly unauthorized types is opened, a message is displayed explaining that the type is unauthorized.

For further information, please refer to https://support.microsoft.com/en-us/help/4512190/remote-code-execution-vulnerability-if-types-are-specified-in-xoml.

We’ll focus on the extensibility points of the C# compiler to customize the behavior of async methods and task-like types. As result, we will be able to write linear, concise, and composable code with the possibility to have control over task scheduling. 

1. Introduction
2. The Split-and-Merge Algorithm
3. Basic Control Flow Statements
4. Functions, Functions, Functions
5. Exceptions and Custom Functions
6. Operators, Arrays, and Dictionaries
7. Localization
8. Testing and Advanced Topics 

SimpleIdServer is an open source framework enabling the support of OPENID, OAUTH2.0, SCIM2.0, UMA2.0, FAPI and CIBA. It streamlines development, configuration and deployment of custom access control servers. Thanks to its modularity and extensibility, SimpleIdServer can be customized to the specific needs of your organization for authentication, authorization and more. 

برنده جایزه بهترین مقاله #C در آوریل 2012 کد پروجکت ...

We all use VisualStudio's autocomplete menu, aka IntelliSense. This is very useful, is not it? Unfortunately, .NET FW does not contain built-in component for autocomplete menu. The proposed control fills this gap.AutocompleteMenu allows you to easily embed a drop-down hints into any TextBox or RichTextBox on your form