I would like this blog post to serve as a quick reference that recalls the basic concept of covariant and contravariant type parameters of generic interfaces in the C# language.I tried to keep the example as simple as possible. Included comments explain the key points. No long stories and no dissertations.

W zasadzie możnaby zapytać po co wynajdywać koło na nowo skoro chociażby przez NuGet można pobrać gotowe pagery (czy jak to nazwać). Praktyka jednak pokazuje, że czasem musimy stworzyć stronicowanie z uwzględnieniem dodatkowych funkcjonalności, których gotowe narzędzia nie posiadają, a nawet gdy dysponujemy ich kodem źródłowym i możemy go zmodyfikować to grzebanie w czyimś kodzie okazuje się często niełatwe. wink W artykule przedstawię więc jak zbudować własne narzędzie do stronicowania czy też paginacji...

Kolejna część artykułu o GC. Zapraszam do lektury: http://msdn.microsoft.com/pl-pl/library/garbage-collector-cz-4-wycieki-pamieci

Introduction to MVC In the last few years a software architecture changed very heavily. From desktop (forms) application which were very popular in Windows XP users move to SOA and now completely start using web based solution hosting in a cloud. Of course such evolution is not something bad, just the opposite in my opinion because web based application are highly scalable, better secured and available from each place in the Earth where user has an Internet connection. Such a big changes in software ...

Have you ever forgotten to lock your computer and went for a lunch? If so then you know what can happen. Your coworkers can send invitation for a party at your place to all co-workers (using your e-mail). They can also mess up with your desktop icons and much, much other fun stuff. The best solution is always lock the system. However sometimes we forget about it. Once I was bored after work I created WinForms application, which starts playing scary sound whe...

Garść cytatów w kontekście Test Driven Development. Można je wykorzystać przy różnych okazjach, np. przy tworzeniu prezentacji albo przy rodzinnych bankietach ;)

When we use the Entity Framework (EF) in multilayer information systems sometimes we want to extend classes generated by EF by adding some common properties or functions. Such operation cant be conduct on *.edmx data model so we need to make some improvement in our solution. Lets begin... Lets assumed that in our soulution we have only three layer (three project):Client console application which has reference to the second layer  - 'ConsoleApplication' project nameClass library project with class i...

Since SQL SERVER 2005 it is possible to store XML data in database by using dedicated data type - XML. This type solved many programming problems such storing XML data as simple text which was very unpleasant to maintenance  and detecting errors in document structure. Now stroring XML data is very simple and requires only the creation of column in XML data type. But sometimes we may want to do reverse operation. I mean generating XML document or fragment from non XML columns in a single SELECT statement....

In SQL SERVER 2005 the most common data type for storing BLOBs was an IMAGE  datatype. When SQL Server 2008 and later SQL SERVER  2008 R2 occured the image datatypes coexists with several new and recomended by Mictosoft BLOB datatypes such varbinary(MAX). Let`s have a look: varbinary(max) /binary(n) variables store variable-length binary data of approximately n bytes, may store a maximum of 2 gigabytes.image variables store up to 2 gigabytes of data and are commonly used to store any type of data fi...

An asynchronous operations become very popular in modern programming because by using its developers can take full advantage of multicore processors and perform several operation at the same time. Multithreding exists in ASP.NET since 2.0 version but it was very sophisticated to use it. However starting from .NET 4.5, ASP.NET is fully compatible with all these great features. To demonstrate how to start with the asynchronous operation in ASP.NET 4.5 I`ve created very simple solution which consist of ...