Developer interview questions – Logical thinking problems
Some logical thinking questions that can be used to test a developers ability to code a solution to a problem. Most of the problems below should be solvable in 45min.
Category Archives: Technical Journal
Routing engine: Library to identify, validate, transform and deliver messages.
A group of people that I know had a need to receive files, identify what they getting, validate it and then to transform it and deliver it to another system. I was convinced this could be done with a generic library and so I set out and coded this. I call it a Routing engine.… Read More »
Could not load type Microsoft.VisualStudio.Shell.Interop.IVsReferenceManager2
I received a fresh laptop this week and after installing a fresh copy of Visual Studio 2017 Professional, I started getting the following error when trying to add a reference to a project.
.net core GetHashCode inconsistant
I noticed something interesting today with .net core. The Object.GetHashCode() method is not returning consistent values.The values are only consistent for the instance of the .net core process.
Integrate SAML2 into Asp.Net using Component Space
Recently I had to do a implementation of SAML2 within .Net, .Net does not have any native support for SAML2 and as a result I had to approach a 3rd party provider called Component Space. Their support is really first class.
Is WCF faster than ASP.NET Core?
Say what? Impossible…
Writing my own Xonix game.
A few months ago I took on a little side project to try and write my own version of a classic game from the 80’s – Xonix. I have worked on and off on it since then, more off than on and spent a total of 7 days on it. This little game has given… Read More »
What is Docker?
Docker is the latest technology to hit the I.T. industry but what is it? Before the realization of the cloud every software company had to develop their own method to deploy their software. This was costly to do and took up many resources and time. Docker is a standardized method to deploy software using containers.… Read More »
WS-Federation Single Logout (SLO)
WS-Federation Single Logout (SLO) is not supported by the Microsoft WIF libraries. This is mentioned in the Programming Windows Identity Foundation book of Vitorrio Bertocci on page 121. This should however only affect you if you have written your own IDP / IP-STS. As a result one can only sign-out from a single site at… Read More »
Integrate Ws-Federation into Asp.Net Core
To Integrate Ws-Federation into .Net Core is straight forward although the documentation of this topic is really lacking. In the article below I have some code snippets showing how to do the integration.
WS-Federation metadata generation tool
To generate ws-federation metadata for your own STS use the following tool. Federation metadata generation tool on GitHub or you just download a copy of the source here from my site. The tool will not create a federation metdata file for a relying party (RP). To create a federation metadata file for a RP use the XML… Read More »
Read Google chrome SAML cookies.
Recently I had to investigate for a situation where a user would sign into a Google chrome account and a desktop application on the same machine had to somehow pick up the cookie and use it to communicate to web services, very similar to Cross browser \ application SSO.
Simple global exception logger for asp.net core
I am sure many companies are slowly doing the migration from web forms in asp.net to MVC with asp.net core and with that migration comes the need for diagnostics or exception logger. In this article is a very simple example for exception logging.
Memory leak within WCF?
Memory leak within WCF? So yesterday my team had to trace a possible memory issue within our application. We used the built in memory tools within Visual Studio and identified that the ‘leak’ was within our WCF infrastructure. What was strange was that the problem came from the System.ServiceModel.Channels.BufferManager which is native .net code… So how… Read More »
Bug in RemoveServerHeader attribute for IIS 10+
Bug in RemoveServerHeader attribute for IIS 10+ There is a bug in RemoveServerHeader for IIS 10+ as documented here. I documented the new attribute in IIS 10 here back in March 2018.