Things Happened

I am software developer, husband, father of 3 children.

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The good source of tasks for interview questions

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How to preserve exception stack?

Now everyone knows that you have to use “throw;” to rethrow an exception with the original stack. But when your requirements don't allow to get throw at once? This happens with async tasks quite often. Starting from .net 4.5. you have a helper class that captures all required info and rebuilds exceptions stack:

ExceptionDispatchInfo.Capture(mySavedException).Throw();

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Automatically request and use Let’s Encrypt certificates in Dotnet Core

Let’s Encrypt is the “free, automated, open Certificate Authority” that wants every website to use encryption by default, by making it easy…

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Selenium 3.6.0

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Regex to replace JSON array property value

I got an idea to replace (hide) on fly JSON object responses from the server API on the logger with help of short REGEX:

The JSON objects are in something like this { “prop”:”value”, .....}

For example to hide  ActivationPassword  field I use next snipset:

$json -replace "(?<=(?<={).+(?<=("ActivationPassword"\s:\s")))(.+)(?=(?=").+(?=}))","<password>"

The idea in a lookahead and lookbehind implementation - they both matchs text but do not got included in the result.

So first block (look-behind) targets a JSON start block ‘{’ and skips up to desired field “name”:”value”. Then you can spot (.+)  part for value.

Finally, look-ahead block finalizes JSON message fragment ‘}’.

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Unable to Compress JSON Result in IIS 7.x

Recently I worked on a problem where there was an issue with MIME type application/json from being compressed in as expected in IIS 7.5. After checking the starting steps like are the proper roles installed on the web server, then went about collecting the applicationHost.config (from %windirSystem32inetsrvconfig) and the associated web.config files to...

The dynamic caching in IIS may require configuring frequency parameter

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Custom SSL generation on Windows

http://day.ir/en-us/articles/ssl/create-csr-sha2-algorithm

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Windows VPN routes

In case you need automatic routes added after VPN connection established on the windows machine (WS2012+,W8.1+). Start powershell as administrator and issue: Add-VpnConnectionRoute https://technet.microsoft.com/en-us/library/dn262649(v=wps.630).aspx

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Tool for visualizing algorithms.

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Good compilation of resources

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MS Application Request Routing – Reverse Proxy

IIS reverse proxy

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Async operations in .Net

Its concept in C#5 with TPL are very close to a popular javascript framework - Promises.

The general usage pattern is: var task = DoAsync();

if( task.IsCompleted) { /* process task.Result */ }

task.CompleteWith(t=>ProcessSuccess(t), TaskContinuationOptions.NotOnFaulted);

task.CompleteWith(t=>ProcessError(t), TaskContinuationOptions.OnlyOnFaulted); /*t.Exception.InnerException*/

Also its recommeded to keep all async operations together, mix with synchronous will cost you all of async benefits vapored and can produce thread locks.

I found this blog very informative: https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-3-runtime-context

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Open an Administrator command prompt.

Press the Win key, type cmd.exe, and press Ctrl + Shift + Enter to run the Command Prompt as Administrator.

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It's very interesting idea to optimize system drive using VHD files

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Using mimikatz on windows user can export certificates that were setup using Symatec PKI Client and were marked non-exportable.

Hack PKI certs for use on linux