Viacheslav Eremin interview about DOT NET (eng lang)

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What's a cool thing you've coded recently? What's something you've built that you're proud of?
During 2016 year I have not new big projects, in this way I am worked only as freelancer.
I make about 20 various projects with different difficulty for various customers.
Some of this freelancer's projects I was described in page http://vb-net.ru/FreelanceProjects/Index.htm
Besides program for money I was created some program to himself, for examples parsers that searching new jobs in online
job board. This parser I describe in page http://vb-net.ru/FreelanceParser/Index.htm
Clearly, fact of absent god new projects forced me to search new job.
But before last year I was created many-many interesting and big projects. List of biggest projects of my life placed
in page http://www.vb-net.ru/Resume/Index.htm
In all of this project I worked as architector or project manager or team leader.
Best of my site is desen.bg, shell-auto.ru, ocmr.ca, flyseason.ru - but all of this my sites worked perfectly during
some years and after that this projects was closed.
There are only ne my big project, that has crasy commercial success - http://votpusk.ru/
This project consist about 100 small sub projects and has millions of visitors each month during more than 12 years.
On another side this projects receive a lt of many for owner of this projects. Another my projects not have similar
commercial success and was frosen after 3-5 years.
What development tools do you use daily?
VS2010 and VS2015 is my main tools for development - one of this is incompatible with another and this tools
I place in separate cmputer. But DB I develop only in MS SMS. Commonly I have 100-200 liked tools for develpment.
I have a list of my likely tools in page http://www.vb-net.ru/RedCamputer/index.htm for each directions of development.
Do you have any personal projects? What kind?
Some years ago I was trying to start internet projects for my own money. But it time I undestand that I am developer only
and best mode for me is working for money of employers or investors (not for my own money). Main point of this my
opinion is that most of internet projects are unprofitable. For example biggest and difficulties projects of my life
(desen.bg, flyseason.ru, ocmr.ca, gisis.ru and another) not brought big money to his owner. And this is not a small
business. For examople (I may look at order in DB) shell-auto.ru has order from customer more than $50.000.000
however even this projects is unprofitable for owner. So, during my 30-years programmer career I saw so many beautiful
projects for his owner, and now I have no desire to start new my own projects.
Do you use any source control software? If yes, which one and why do you use it?
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Viacheslav Eremin
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Yes, I used various control software - TFS, SVN, GIT and another. Most of this software I may set up and tuning
not only client software, but a server of source control. For example I write some article, how to set up and tuning
SVN server - http://www.vb-net.ru/Subversion/index.htm - this article I write about 10 years ago.
Clearly, before some last years my likely source control software was SVN (for example votpusk.ru I develop in this
source control), but some last years I should working in GIT. Some advantage of this environment is to work without
server, in local computer only.
Have you ever implemented any deployment strategy for web apps over multiple servers and databases? Please explain
Yes, all of my big projects placed in many server. For example my biggest project votpusk.ru I was placed in 8 bare
metall server http://www.vb-net.ru/MyServices/1.jpg
All of information infrastructure of this company planned and deployment with me.
Commonly my strategy is split big task for sub-domain, place each subdomain in separate virtual machine (I like VmWare)
and created background server for fileover, that containes same site, but sleeping before front server is working.
If one front enf server is low I share the processor and disk loadind to another server. I votpusk I started from just
only one server and after some years I have 8 server in this project.
Clearly, I prefer to build my own server structure of project than using shared hosting from big company like MS or
Amazon. My own servers with full control for me has many-many advantage, greater reliability and less expensive, than
shared hosting with restricted control from big company.
What is a new development language/technology you're interested in?
Commonly fashion technolofy is losed classic technology, that exist more than 5 years. It's a main and great point of
my view. But there are some request, where old technology can not handle. In my opinion there are one point with
advantage of new technology - working in mobile platform. Best way, if mobile platform will support my likely front end
(FLEX), but war of many company against Adobe make Adobe Flex front end is dead. So, I am interesting for new technology of mobile platfo
new front end framework in ASP.NET. But now I have not a big projects with same fashion framework (like Angular), that
I initially started from outset. But it's interesting for me - modern frontend framework working perfectly in mobile
platform, so now it's a main point of my evolution as programmer.
How do you make your code easy to maintain?
Commonly code must be divided at standard leyer (for example 3-tier, but I prefer 5 tier). All layer must has strong
bound and must have clear and understable functional. Inside each layer code must be grouped to objects with clear
undestanding what each objects doing. Big site should be cut to subdomain, each subdomain should be placed on separate
virtual machine. Big database should be cut in separate DB, fro example DB with persistent data (that not need backup
everyday) and daily changing data (that need everyday backup). There are many case to make project easy to support,
for example, one of my best way is stored all image in DB. This solution I desctibe in my blog more than 10 years ago
http://www.vb-net.ru/asp2/34/index.htm Advantage of this solution is backup and copy gigabytes of image from some
seconds. Alternative way (store gigabytes if image in filesystem) has many days for copy one filesystem to another
location.
In ASP.NET, briefly explain the usage of Global.asax?
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It's a main site of ASP.NET application. Nothing projects without use this important file. First of all - in that file
has handler Application_start. In this event usually need read all immutable data from DB. Second important point of
this event is to create separate task, that on with parallel thread with main thread, that enrol ASP.NET request.
Second impotant handler that handles from global.asax is Session_start. In this handrer usually need check autintification
of user session. And third main handrer for ASP.NET is placed on Application_BeginRequest, that handles from globa.asax
too. Usually this events used to manually redirection or another impotrant actions.
What’s wrong with parsing a date like this: DateTime.Parse(myString)
There are two main problem to parsing datatime. First of it is difference between culture of myString and culture of
current thread. And second problem is non-existing datetime, such as 31 february. So in this cases parsing of string
with datatime acquire the exeption. There are some way to solve this problem. One of them is to use Datetime.TRYparse
How would one do a deep copy in .NET?
Deep copy is a technology of creating new object with new copy of all referenced objects, in that reference old objects.
If I know the structure of objects, that I will have created deep copy, I may use MemberwiseClone or BlockCopy (if old
object contains only array). If I have complex objects with difficult structure than simplest way is serialize complex
object to MemoryStream or maybe in DB (if hard copy needed) and after that create new object on deserialize method.
If this operatins repeat in projects many times I prefer create additinal generic interface, that I usually named
CreateHardCopy and objects, that need deep copy must the implement this interface.
What are the differences between a Primary key and a Unique key?
Clearly, primary key is a physical order of record in hard disk. Unique key is a additional index structure, that
applied to data and prevent duplicate data in secndary fields of data.
What is the difference between “constant” and “readonly” variables in C#?
Constant creating in compile time and stored in MSIL byte-cde. It's a static variable that can not be changed without
recompile program (or another technology, based on reflection). Readonly variable creating in run-time, has constructor
in that variable may acquare the value.
If you were asked to build an api, would you use .NET MVC or .net Web API, and why?
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What kind of api I need build? This questions is undefined...
Latest version MVC projects in VS2010-2015 include WebApi controller. Lovest version
of MVC (for example MVC 3) not has a WebApi controller. But most of types Web Api may build without WebApi controller
in latest version of studio and MVC. For example so far main way to build Web API was SOAP/WSDL services. Clearly
this type of WebAPI has small difference to latest WebAPI brand name in latest MVC and VS version. SOAP/WSDL web API
used only get request in HTTP header and concrete type of operations (Set/Put/Delete etc) send to server as parameter
in body of request. In modern version of brand name "WebAPI" type of operation moved from body to header of request to
server (this version of webApi named RESTful).
So, WEB API may build in many way:
1) as handler ASHX in ordinary MVC project, in classic ASP.NET project or in SOAP/WSDL service projects. I use
this way many-many times and learn another programmer how to use this way - http://www.vb-net.ru/WebHandler/index.htm
2) as SOAP/WSDL services, may be this way is my likely way. I use this way many times too and teach another programmer
how to use this way http://www.vb-net.ru/SimpleWCFconfig/index.htm
3) in classic ASP.NET webApi may buils with tag <webMethod>
4) In MVC projects Web Api may build with way 1) - if not need a RESTFul API.
If need to build ResfFul WebAPI in MVC project should be add a web api controller
Commonly type of Web API defined by client (front end) compatibility. For example, if as front end used FLEX,
it support any type of Web Api - from 1) to 4). jQuery may work in anytype of WebAPI, but most fashion front end
framework usually can work only web API for type 4).
Explain how you would implement gzip compression on a .NET Website
If browser want receive page from server first of all browser send to server header, what technology it supported,
about prefer languages etc. If browser said "I am supported GZIP" no need anything actions from programmer or site
administrator. IIS automatically ZIPped page and send it to browser. It's a main stream, used in most case. But
if site has needed specail tuning for this function IIS have dial windows to tuning GZIP.DLL (this is a part of IIS)
Another way to tuning this function throught site web config. For example, to reduce processor loading some types
of files may be forbidden to zipped.
Write some C# code to determine whether or not a word is a palindrome (reads the same backwards as forwards)
static string Reverse(string q)
{
char[] Arr1=q.ToLower().ToCharArray();
Array.Reverse(Arr1);
return new string (Arr1);
}
if (q.ToLower() == Reverse(q)) return true;
Write a CSS rule that will make all anchor tags text red if the page is viewed on a mobile device.
@media all{
a {color:red}
}
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What can you do to positively impact the SEO of a web page when writing HTML5?
Commonly this question like question "When BMW company will changed the shape of BMW bamper?" I will explain more
details of my view to this difficult problem. All company, that has own search engine software, has a own secret
algorithm of ranking page. In fact, now first 10 or more page in ranking for most of user questions has build manually.
Nothing technology in the world that can to changing this internal rules of Google company (or Yahoo or Yandex etc).
All similar company look on SEO as a special SPAM technology, that can distort his algorithm of ranking (that for mind
of this company is objective and answer for user preferences). This is a first main point.
The second main point, that HTML5 is a TAG-languages, not a content for site, that user seatch.
But recently, in this year, Google full chahged his interhal rulles for ranking page (like BMW unexpectedly changes the
shape for his bamper to Mersedes). WTF? It's a biggest suprise for the internet world. In this year Google rebuild his
rules to rainking page for user request. Content of site now unimportent! At now important site certificate, that
admin of site uploading to IIS. And site with valid sertificate move up to ranking comparing site without SSL!
Content compliance is not important than site certificate!
And when gooole will go to the next step "HTML tag willbe important than content"? But in another side this step has
full opposite to previous step by google and another similar private company. Current rules said "if domain lives
longest time than ranking of this site is higher". But oldest domain usually used oldest version of HTML.
Explain how you would implement custom error pages in IIS
Commonly there are three way. First way is to use IIS dialog tuning screen. Second way should use tag 'customErrors'
and douter tag 'error redirect' in the web config. And third way is throw all exeption in own code and show error page
without standatd oportunity of IIS.
Open the following website: http://dubaiairports.ae and name the top 3 things that you can do to improve the loading
speed.
First of all is questions - how to speed important for this projects?
1) If speed is very important the main way is precompiled ASP.NET site to static HTML page and user may show only
static HTML site. This techology I used in my project VOTPUSK.RU and I describe this technology in this page -
http://www.vb-net.ru/CacheEnterPage/index.htm By sheduler static ASP.NET page will be renew.
At this time this site looks like most stupid site in the world - it show one small table in entering page and for
make this small actions this site doing 145 times to server 145 and loading to browser 6,5 MB of code including 48
various javascript library that has weight 1,3 MB. For my opinion this site not need to provide his function
all of library, what it used. What this library? I see - jQuery, Signal-R, Backborne, underscope, TELERIK and still
about 40 front end library. What need to use all of it to showing one simple table?
Goal of building this site I see so: programmer is interesting to teching all modern existing front end.
That's all - usability of site from user is not important.
2) So, the second way - rebuild this site without most of this framework. Delete step by step all this modern
front-end library still goal of speed will be reached. And in last step, if needed speed is not reached then delete
AJAX and rebuil to simple static site (with same functinal and view to user).
And if goal of speed in this way unattainable then goin to techology number one, on which I build VOTPUSK.RU
and another my projects.
3) Another way is improve hardware in hosting. Young programmer don't understant commonly that his doing. It read
adversting from Microsoft, Amazon and another big hosting company and choose this company. It's a biggest mistakes!
Anything small own server has better performance than anything plan from Amazon or Microsoft. And hosting in
Amazon or Microsoft will maybe 100 times expensive than hosting in own server.
4) Fourth alternative way to first three way, encouned upper, is to rebuid design of this simple site.
Commonly this site violates all tradition to site building. Main tradition is simple entering page.
Simple as possible. But entering page of this site loading 6,5 Megabytes of data from server for 145 request!
For understanding this absurd I give one example. When I worked in digitalshop.ru (more than 12 years ago) owner
of this project put task for me - entering page not have weigth more than 60 KB. If you will not cope this
goal - you will be fired. Similar task I receive from most of my employer. Maybe importance of weigth of entering
page given by bad communication in Russia, but please compare 6,5 megabytes with 60 kilobytes!
In this way of refactoring this site need a entering facade page, small page and existing page will be moved to back
of the entering small facade page.
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Show us a link for a website, github project, or framework that you think is cool.
Please look at my resume http://www.vb-net.ru/wanted/Resume-BG.pdf - It has many-many links.
Have you ever used Amazon web services? which one and why?
AWS is a datacenter that is a concurent an another big datacenter/hosting from Microsoft (that pull his own brand
named AZURE. Both of this hosting is most expensive hosting in the world. Not interesting to using this servers
without discount. Some last years AWS has adversting action "pay one dollar and receive VDS for one years". This
is interesting actions. Outside this actions using of this servers is very expensive. For example, I have a friend
that has own datacenter. My friend is foundation and owner company ITLDC.COM
Compare price please from this small company and Amazon or Azure.
Colocation of own sever to this small ukrainians company (that has 4 datacenter in the world - Holland, USA etc)
has cost only 30 euro for server. But A4 plan of AZURE (it's perfomance low than own server) has price about $2000
What interesting to use most expensive hosting in the world?
And secondary point of this my opinions - that in my own server I not restricted from enywhere. So, if I may
selected hosting for my employers I shouls select own server, for example one times I record video for process of
start new project - http://www.vb-net.ru/desen/
But, in other side, if company want to use Amazon or Azure than I may deploy my site on that servers too.
On a scale of 1 to 10, rate your football skills.
Sorry, my football skills is absent, low than 1, i.e. zero. I like bike (every day from 10 to 20 km), I like swim at
least 2 times on week, in winter I like skiing.
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