tabs ↹ over ␣ ␣ ␣ spaces by Jiří {x2} Činčura 2026-03-07T16:35:14Z tabs ↹ over ␣ ␣ ␣ spaces by Jiří {x2} Činčura http://www.tabsoverspaces.com/ Using RPKI on MikroTik RouterOS 7 (7.21) 2026-02-27T14:21:00Z http://www.tabsoverspaces.com/id/233962 I run my personal AS 215777 and as part of learning – and because I consider BGP security important – I wanted to start validating routes using RPKI. Here’s steps I did to enable it on RouterOS 7.21.

]]> Is it faster to index into an array or use switch statement for lookups? 2026-02-25T10:56:00Z http://www.tabsoverspaces.com/id/233961 While working on a PR in Microsoft.Extensions.Logging I saw two variations of code and I wanted to check which one is faster. Not that it mattered in this piece of code, but every little counts and also, I like to explore random things.

Assume you have some numbers (zero-based) that represent predefined strings. And you want to convert those numbers.

]]> Entity Framework Core 10 provider for Firebird is ready 2026-02-08T18:58:00Z http://www.tabsoverspaces.com/id/233960 I’m excited to announce the release of Entity Framework Core 10 provider for Firebird.

]]> Dealing with “Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting ”/foo/bar/data.json“ to rootfs at ”/app/data.json“: mount src=/foo/bar/data.json, dst=/app/data.json, dstFd=/proc/thread-self/fd/11, flags=MS_BIND|MS_REC: not a directory: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type” 2026-02-02T10:53:00Z http://www.tabsoverspaces.com/id/233959 I recently spent great amount of time dealing with the error Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting "/foo/bar/data.json" to rootfs at "/app/data.json": mount src=/foo/bar/data.json, dst=/app/data.json, dstFd=/proc/thread-self/fd/11, flags=MS_BIND|MS_REC: not a directory: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type. I guess I’ll share and maybe this will save some time to somebody.

]]> WUG Days 2026 Praha 2026-01-25T14:16:00Z http://www.tabsoverspaces.com/id/233958 WUG Days jdou i letos do Prahy. Jedna moje session byla vybrána, takže se společně podíváme na parameterized collections v EF Core.

]]> Automated NTS certificate monitoring 2025-11-19T08:48:00Z http://www.tabsoverspaces.com/id/233957 As I’m running my time.cincura.net timeserver I have some monitoring in place. But one thing was missing: checking the certificate for NTS. Although the renewal is semi-automated, having an additional layer of verification provides peace of mind. The challenge is that most monitoring tools do not support NTS, so I decided to create my own tool – which you can now use as well.

]]> CODECON #Žilina 2025-11-07T10:11:00Z http://www.tabsoverspaces.com/id/233956 Už za dvacet dní, přesně, se bude konat CODECON #Žilina. Nikdy jsem na této konferenci nebyl, ale Žilina je rozhodně město, které mám rád. A když vidím, na jakých místech se akce koná, nemůžu se dočkat. Moje session je How I put .NET into Firebird database engine. Ano, název je v angličtině (protože jsem hlupák a nedošlo mi, že CfP můžu vyplnit v češtině), ale jinak vám vše samozřejmě řeknu v češtině.

]]> .NET Developer Conference 2025 2025-11-07T09:58:00Z http://www.tabsoverspaces.com/id/233955 In about two weeks a .NET Developer Conference is going to happen in Köln. I’ll have one session Autoincrement (identity) is not the only option for primary keys.

]]> .NET DeveloperDays 2025 2025-10-10T07:13:00Z http://www.tabsoverspaces.com/id/233954 We’re close to that time of year – time of .NET DeveloperDays in Warsaw. I’m really excited to be there, so let’s talk about what you can listen to from me.

]]> WUG Days 2025 Brno a SQL Server Bootcamp 2025 Brno 2025-08-28T17:02:00Z http://www.tabsoverspaces.com/id/233953 Následující týden se koná, dneska už tradiční dvojboj konferencí, WUG Days a SQL Server Bootcamp v Brně. A tak jako obvykle, připravil jsem několik přednášek.

]]> Application Insights’ sampling ratio affecting other Open Telemetry exports 2025-08-04T07:17:00Z http://www.tabsoverspaces.com/id/233952 I have a small .NET application that manages some specific parts of my Software Defined House aka Smart home. Recently, I decided to transition from Application Insights and I found an unexpected behavior when using pure Open Telemetry exporter.

]]> Announcing time.cincura.net – Stratum 1 NTP and NTS time server located in Czech Republic, Europe 2025-07-23T12:30:00Z http://www.tabsoverspaces.com/id/233951 Ever since I started building my homelab and started playing with networking I wanted to give something back. Something that’s a valuable service. And although I’m self-hosting a bunch of my websites and providing data from my weather stations publicly, it was not it. Until I stumbled upon timekeeping and time servers.

]]> Techorama (BE) 2025 2025-05-19T13:00:00Z http://www.tabsoverspaces.com/id/233950 Next week Techorama in Antwerp is going to happen. And I’m looking forward to all-star sports edition. I was lucky and 2 of my sessions were selected.

]]> Nullable bool and if statement 2025-05-16T11:00:00Z http://www.tabsoverspaces.com/id/233949 I was writing some code in EF Core’s codebase and saw different way of writing condition on nullable bool.

]]> Gopas TechEd 2025 2025-05-16T10:00:00Z http://www.tabsoverspaces.com/id/233948 Příští týden se bude konat Gopas TechEd. Letos jsem připravil 3 přednášky.

]]> Entity Framework Core 9 provider for Firebird is ready 2025-02-06T09:40:00Z http://www.tabsoverspaces.com/id/233947 I’m excited to announce the release of Entity Framework Core 9 provider for Firebird.

]]> Testing latency to Azure datacenters around me 2024-11-05T08:20:00Z http://www.tabsoverspaces.com/id/233946 Purely out of curiosity I decided to test latencies to a few Azure datacenters around me. Specifically, Germany West Central (Frankfurt), Poland Central (Warsaw) and West Europe (Amsterdam). I wanted to test Azure DC in Austria as well, but it is not yet available.

]]> Techorama (NL) 2024 2024-10-06T13:03:00Z http://www.tabsoverspaces.com/id/233945 In couple of days Techorama in Utrecht is going to happen. This year’s theme is funfair. This I was lucky and 2 of my sessions were selected.

]]> Mastering Entity Framework Core workshop (discount inside) and .NET DeveloperDays 2024 2024-09-13T08:09:00Z http://www.tabsoverspaces.com/id/233944 We are couple of weeks from .NET DeveloperDays 2024. Really excited to be there. My main “show” there is going to be Mastering Entity Framework Core workshop.

]]> WUG Days 2024 Brno a SQL Server Bootcamp 2024 Brno 2024-09-02T12:00:00Z http://www.tabsoverspaces.com/id/233943 Tento týden se koná, dneska už tradiční dvojboj konferencí, WUG Days 2024 a SQL Server Bootcamp 2024 v Brně. A tak jako obvykle, připravil jsem několik přednášek.

]]> Tips and tricks for VS debugger for DotNetDevs.at in Vienna 2024-06-24T09:13:00Z http://www.tabsoverspaces.com/id/233942 I’ll be speaking this Thursday about Tips and tricks for VS debugger in Vienna for DotNetDevs.at. You can register here.

]]> .NET Developer Days 2024 Berlin 2024-06-03T07:03:00Z http://www.tabsoverspaces.com/id/233941 One of my favourite conferences – .NET Developer Days – that happens in Warsaw in fall is now having also a Berlin edition. And I’m a big fan of Berliner Fernsehturm. Looks like a perfect combination (well, perfect combination would be to have the conference in Fernsehturm 😉). Anyway, I’ll have two sessions there and I hope to see you there.

]]> Entity Framework Core 8 provider for Firebird is ready 2024-05-23T10:17:00Z http://www.tabsoverspaces.com/id/233940 I’m excited to announce the release of Entity Framework Core 8 provider for Firebird.

]]> Writing “string.IsNullOrEmpty” using pattern matching and comparing the resulting code 2024-05-13T11:55:00Z http://www.tabsoverspaces.com/id/233939 I was working on a codebase the other day and it used heavily the pattern matching features of C#. And as I was writing string.IsNullOrEmpty it got me thinking whether I could switch from this very specific method to using (maybe) a more general pattern matching approach. And also, how that compares in performance.

]]> MiZeroPageThread 2024-05-08T14:53:00Z http://www.tabsoverspaces.com/id/233938 00000000000000000000000000000000000000000000000000000000000000000000000000000000 ]]> WUG: Async a await pěkně od podlahy (Olomouc) 2024-04-30T07:23:00Z http://www.tabsoverspaces.com/id/233937 2.5.2024 od 17:00 na WUGu v Olomouci si popovídáme o async a await. Přednáška Async a await pěkně od podlahy má v mém reportoáru už asi 30 podob. Pokaždé když ji dělám řeknu něco jinak, někdo se zeptá na něco zajímavého atp. a ani tady to nebude jinak. Tak se přijďte podívat a udělat se mnou další podobu.

]]> Global Azure 2024 2024-04-18T07:44:00Z http://www.tabsoverspaces.com/id/233936 Zítra, 19. dubna, se koná globalní akce Global Azure 2024. I já přispěju trochu do mlýna s tématem Azure Spot instances as your secret weapon.

]]> WUG: Laďte jak profík ve Visual Studiu a Práce se stringy v .NET 8 a SearchValues (Zlín) 2024-03-26T13:19:00Z http://www.tabsoverspaces.com/id/233935 16.4.2024 od 17:30 na WUGu ve Zlíně si dáme dvojpřednášku. Laďte jak profík ve Visual Studiu a Práce se stringy v .NET 8 a SearchValues.

]]> Warsaw IT Days 2024 2024-03-22T08:41:00Z http://www.tabsoverspaces.com/id/233934 I’ll be speaking at this years Warsaw IT Days 2023. One sessions What’s new in C# 12 will be in-person in Warsaw, while other Dynamic PGO in .NET 8 and why you need to know about it is VoD.

]]> WUG Dev Day 2024 2024-03-01T10:36:00Z http://www.tabsoverspaces.com/id/233933 V pondělí se uskuteční WUG Dev Day 2024. Připravil jsem dvě přednášky.

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