.NET Developer Days 2016 - Grand finale

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The time has come to summary .NET Developer Days 2016. I think that each conference can be judged based on 3 main factors: organisation, presentations, networking so I'll write a few words about each of these topics.

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Do not forget about GO

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

Almost 4 years ago, I wrote a short post in Polish about problems that may occur if we forget about GO keyword in our scripts. I decided to write this post again, this time in English, because recently I helped to fixed exactly the same problem again. As a remainder, GO keyword instructs tools like SQL Management Studio, sqlcmd... to send the batch of T-SQL code to the server. Now, let's look at the following code that creates a stored procedure and tell me what is wrong here:

CREATE PROCEDURE dbo.pr_Fun
AS
BEGIN
    /*...*/
    RETURN
END

GRANT EXECUTE ON dbo.pr_Fun TO public
GO

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Report from the battlefield #6 - Auto-Property Initializers + a non-binary serialization

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

I can bet that you've already heard about and used Auto-Property Initializers and that you love them. At least I do so ;) Here is a small example. In this case an Auto-Property Initializer was used to generate unique identifiers for instances of Entity class. Trivial, isn't it?

public class Entity
{
   public string Guid { get; } = System.Guid.NewGuid().ToString();
   /*...*/
}

What is important we have guaranteed that a given initializer will be executed only ONCE for an instance of a class. Otherwise it will have no sense! In other words our expectations is that if we create a new instance of Entity class it's identifier will not change. It is generally true, but there are some caveats.

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.NET Developer Days 2016 - Workshops

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In my previous post about .NET Developer Days 2016 I wrote generally about the conference and about presentations I'd like to see. This time I want to drop a few lines about pre-conference workshops (sessions). They will take place just a day before the actual conference (GoldenFloor, Millenium Plaza – Warsaw, Al. Jerozolimskie 123 a) and you could choose from:

• Dino Esposito - Modern Web Development with the ASP.NET MVC Stack
• Ted Neward - Busy .NET Developer’s Workshopon the CLR
• Adam Granicz - Functional Programming on .NET with F# – Become a Programming Jedi Now!
• Daniel Fisher - Resilience and cloud patterns TOGO: build useful stuff in JS and C#

The links above will lead you to the description of each session. However, I have a surprise for you. I contacted with experts who will conduct workshops and asked them a few questions. Here are additional information that I got. You'll not find them anywhere else.

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AjaxExtensions.BeginForm doesn't work. Really?

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

The goal of using Ajax is to communicate with the server asynchronously without reloading the entire page. Specifically AjaxExtensions.BeginForm can be used to updated a selected part of a web page. It is relatively easy in use but can be also troublesome. Especially, when we try to apply it in an application which wasn't using Ajax earlier. I decided to wrote this short technical post because recently I came across the following issue the few times:

AjaxExtensions.BeginForm redirects a user to a new page instead of refreshing a fragment of a current one.

This problem has an easy explanation. Under the hood AjaxExtensions.BeginForm uses Java Script library called Microsoft jQuery Unobtrusive Ajax. The issue is that this library is not installed by default if we create a new project. It's easy to forget about it.

If you have the described problem:

• Check in packages.config file contains Microsoft.jQuery.Unobtrusive.Ajax package.
• Check if jquery.unobtrusive-ajax.js file is referenced in html e.g.: <script src="/scripts/jquery.unobtrusive-ajax.js"></script>
• If you use bundles checik if jquery.unobtrusive-ajax.js was included in a bundle e.g.:

  public static void RegisterBundles(BundleCollection bundles)
  {
     ...
     var js = new ScriptBundle("~/bundles/MyBundle").Include("~/Scripts/jquery.unobtrusive-ajax.js");
     ...
  }

• Besides, check if a bundle with jquery.unobtrusive-ajax.js is rendered properly e.g.:

  @Scripts.Render("~/bundles/MyBundle")