vlad navazhylau's blog - coding

Generic Singelton pattern in C# and VB.NET

vlad — Mon, 13 Oct 2008 08:40:08 +0200

//SINGLETON - C#

using NUnit.Framework;

[TestFixture()]
public class SingletonTest
{
    [Test()]
    public void ObjectsAreTheSameTest()
    {
        DeploymentInfo firstDeployment = Singleton<DeploymentInfo>.UniqueInstance;
        DeploymentInfo secondDeployment = Singleton<DeploymentInfo>.UniqueInstance;
        Assert.AreSame(firstDeployment, secondDeployment);
    }
}

//Singleton Pattern 
//Generic Version

public class Singleton<T> where T : class, new()
{
    private Singleton()
    {
    }

    private class SingletonCreator
    {
        static SingletonCreator()
        {
        }
        // Private object instantiated with private constructor
        static internal readonly T instance = new T();
    }

    public static T UniqueInstance {
        get { return SingletonCreator.instance; }
    }
}

'SINGLETON - VB.NET

Imports NUnit.Framework

<TestFixture()> _
Public Class SingletonTest
    <Test()> _
    Public Sub ObjectsAreTheSameTest()
        Dim firstDeployment As DeploymentInfo = Singleton(Of DeploymentInfo).UniqueInstance
        Dim secondDeployment As DeploymentInfo = Singleton(Of DeploymentInfo).UniqueInstance
        Assert.AreSame(firstDeployment, secondDeployment)
    End Sub
End Class

'Singleton Pattern 
'Generic Version

Public Class Singleton(Of T As {Class, New})
    Private Sub New()
    End Sub

    Private Class SingletonCreator
        Shared Sub New()
        End Sub
        ' Private object instantiated with private constructor
        Friend Shared ReadOnly instance As New T()
    End Class

    Public Shared ReadOnly Property UniqueInstance() As T
        Get
            Return SingletonCreator.instance
        End Get
    End Property
End Class

NHiberanate datasource for ASP.NET

vlad — Mon, 22 Sep 2008 07:54:38 +0200

NHibernateDataSource: A DataSourceControl for ASP.NET 2.0

http://www.codeproject.com/KB/aspnet/NHibernateDataSource.aspx

Playing with Regex

vlad — Mon, 22 Sep 2008 07:51:16 +0200

Example - URL Extractor
http://www.dotnetcoders.com/web/Learning/Regex/exHrefExtractor.aspx

http://regexlib.com

http://sexyregex.com/regex/test/replace/3863#testdata

LINQ to SQL, WCF, REST and AJAX alternatives

vlad — Mon, 22 Sep 2008 07:45:30 +0200

Rick Strahl posted his session slides and samples from his ASP.NET Connections. Really good presentations.
http://west-wind.com/weblog/posts/336745.aspx

LINQ helper tools

vlad — Mon, 22 Sep 2008 07:29:38 +0200

LINQPad lets you interactively query SQL databases in a modern query language: LINQ. Kiss goodbye to SQL Management Studio!
http://www.linqpad.net/

Visual LINQ Query Builder
http://code.msdn.microsoft.com/vlinq/

Storing Binary Data to Database

vlad — Mon, 22 Sep 2008 07:27:32 +0200

http://www.beansoftware.com/ASP.NET-Tutorials/Binary-Files-To-Database.aspx

Good VB.NET and Linq to XML resource

vlad — Sun, 27 Apr 2008 03:27:46 +0200

Beth Massi posted nice presentation on Ling to XML on Infoq.com.
http://www.infoq.com/presentations/massi-linq-xml

She also rights regularily on her blog "Sharring the goodness tha is VB" - http://blogs.msdn.com/bethmassi/

VB.NET 9.0 has nice syntactic sugar tha C# 3.0 don't have for working with XML and Linq.

Quest: is AJAX bad for SEO?

vlad — Tue, 22 Apr 2008 12:55:59 +0200

This sounds like a simple question. I will say like many other developers/architects/consultants - "It depends..."

Bottom line AJAX is bad for SEO!
For publicly facing company websites, were SEO important, stick with the server side scripting such as ASP.NET, PHP, Ruby on Rails and others.
I am not mentioning static HTML pages here since medium and big size companies most likely will have data driven web site.

If you are building Line of Service business application AJAX will only make your application better.
Do not think twice learn it well and use it.

If you absolutely have to use AJAX follow "Unobtrusive JavaScript" pattern.
AJAX is great tool when used for proper application types.

Here is my prediction -> 3 years from now Search engines will learn to understand and properly index and rank RIA/AJAX/FLASH/Silverlight/Flex/Put your faviorite client side technology here. Until then ...

AJAX and SEO: How to have an SEO Friendly AJAX website using jquery
http://www.davidpirek.com/blog.aspx?n=AJAX-and-SEO:-How-to-have-an-SEO-Friendly-AJAX-website-using-jquery

http://www.seomoz.org/crawl-test

12 More SEO Tips for 2007 http://www.seochat.com/c/a/Search-Engine-Optimization-Help/12-More-SEO-Tips-for-2007/

SEO Myths http://www.seochat.com/c/a/Search-Engine-Optimization-Help/SEO-Myths/3/
SEO for AJAX http://www.johnon.com/270/seo-for-ajax.html
AJAX, Web 2.0 and SEO http://www.hybrid6.com/webgeek/2007/01/ajax-web-20-and-seo.php
Web 2.0 Technologies and Search Visibility http://searchenginewatch.com/showPage.html?page=3624222
Unobtrusive JavaScript http://en.wikipedia.org/wiki/Unobtrusive_JavaScript
CSS, AJAX, Web 2.0 & Search Engines http://www.seroundtable.com/archives/006889.html
Search engine optimization http://en.wikipedia.org/wiki/Search_engine_optimization

LINQ

vlad — Tue, 22 Apr 2008 12:40:12 +0200

Link to Everything: A List of LINQ Providers
http://blogs.msdn.com/charlie/archive/2008/02/28/link-to-everything-a-list-of-linq-providers.aspx

LINQPad lets you interactively query SQL databases in a modern query language: LINQ. Kiss goodbye to SQL Management Studio!
http://www.linqpad.net/

Visual LINQ Query Builder http://code.msdn.microsoft.com/vlinq/

Creating Custom Cache Dependency

vlad — Tue, 22 Apr 2008 12:36:01 +0200

http://www.dotnetbips.com/articles/864c5b09-3e46-48b7-b4e8-f80d0db6c57c.aspx