Enabling TLS 1.2 in your .NET framework applications

A functionality of one of the products I’m working on suddenly stopped working without any code changes on our side. Our application connects to a web service to get some data and that no longer worked, our customers getting the following error in their logs “The underlying connection was closed: An unexpected error occurred on a send.” The first thing to do was checking whether the web service was still up and running as expected. The requests made with SoapUI or Postman were all successful, so it was actually something in our application that was actually wrong. So I decided to use Fiddler to look at how our requests look and what do we get back.

Unit testing non-public types and members for .NET projects

Unit testing is usually used for testing public types and members. However, there are cases when you might need to test types or members that are not public. These could be internal classes or private helper methods, for instance. Whether that is proper unit testing or beyond its scope is not a discussion that I want to get into here. However, in this post, I will show how you can unit test non-public types and members from .NET assemblies.

When faced with the need for testing non-public types and members you can use several approaches:

  • change the accessibility to public; you can do that perhaps only for debug builds and keep the intended accessibility in release builds by using conditional compilation.
  • provide public members of a class that invoke private ones;
  • use reflection.

The first solutions involve changing the API only for the sake of the testing. The last solution avoids that but requires more work. To help with that, the Visual Studio unit testing framework provides some helper types that enable you to focus on the actual testing and be less concerned about the reflection details.

Visual Studio 2017 Releases

Microsoft recently announced that it released version 15.5 of Visual Studio 2017 (and Visual Studio for Mac version 7.3). There are various improvements to performance and diagnostics (such as cutting the solution load times for large C# and VB projects by half), new features for C#, C++, F# development, and others. You can read the…

How to determine what CLR versions are installed using C++

You may have multiple versions of the .NET framework installed and used on your machine. The framework has two components: the set of assemblies that provide functionalities for your application, and the common language runtime (CLR) that handles the execution of the application. These two components are versioned separately. If you what to see what…

Field trip report from ITCamp 2016

Last week I have attended ITCamp in Cluj-Napoca, Romania. The conference has already established itself as the most important community-driven technology conference in Romania and lately, as the organizers put it, its focus has shifted from being a Microsoft-centric conference to a technology-centric conference. And this year it has been larger than ever before: 600…

Render the screen of a Windows Store App to a bitmap in Windows 8.1

In WPF, Silverlight and Windows Phone it is possible to render a visual object into a bitmap using the RenderTargetBitmap. This functionality, that I find pretty basic, was not available for Windows Store applications. Fortunately, Windows 8.1 provides that functionality for Windows Store applications too, through the same RenderTargetBitmap class. There are some limitations though:…

Bindings for DataGridView hosted in an MFC application

A WinForms DataGridView control has the ability to automatically generate its columns and populate from a specified data source (which can be a DataSet, a simple list or something else). All you have to do is something like this:

When you do the same in MFC, it doesn’t work (supposing that you followed all…

error C3510: cannot locate dependent type library ” {bed7f4ea-1a96-11d2-8f08-00a0c9a6186d} v.2.4

Problem I have recently migrated a C# 2.0 project registered for COM interop to .NET 4.5 and when I imported the type library in a C++ project with no_registry, suddenly I got some errors because the type library could not be imported. Here are the steps to reproduce: create a .NET Class Library project and…

Why won’t my .NET redistributable assemblies show up in Visual Studio’s ‘Add Reference’ dialog?

The Problem You install a .NET redistributable package and want to reference the assemblies in your project. However, though everything is correctly installed to GAC, the assemblies don’t show up in Visual Studio’s Add Reference dialog in the .NET tab (regardless of what version of Visual Studio you have). The Cause Redistributable assemblies are intended…