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• C# 4.0: Dynamic Programming

  - by Paulo Morgado

  The major feature of C# 4.0 is dynamic programming. Not just dynamic typing, but dynamic in broader sense, which means talking to anything that is not statically typed to be a .NET object. Dynamic Language Runtime The Dynamic Language Runtime (DLR) is piece of technology that unifies dynamic programming on the .NET platform, the same way the…

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• C# 4.0: Named And Optional Arguments

  - by Paulo Morgado

  As part of the co-evolution effort of C# and Visual Basic, C# 4.0 introduces Named and Optional Arguments. First of all, let’s clarify what are arguments and parameters: Method definition parameters are the input variables of the method. Method call arguments are the values provided to the method parameters. In fact,…

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• Visual Studio 2010 Service Pack 1 And .NET Framework 4.0 Update

  - by Paulo Morgado

  As announced by Jason Zender in his blog post, Visual Studio 2010 Service Pack 1 is available for download for MSDN subscribers since March 8 and is available to the general public since March 10. Brian Harry provides information related to TFS and S. "Soma" Somasegar provides information on the latest Visual Studio 2010 enhancements. With…

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• LINQ: Single vs. First

  - by Paulo Morgado

  I’ve witnessed and been involved in several discussions around the correctness or usefulness of the Single method in the LINQ API. The most common argument is that you are querying for the first element on the result set and an exception will be thrown if there’s more than one element. The First method should be used instead, because it…

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• C# 5.0 Async/Await Demo Code

  - by Paulo Morgado

  I’ve published the sample code I use to demonstrate the use of async/await in C# 5.0. You can find it here. Projects PauloMorgado.AyncDemo.WebServer This project is a simple web server implemented as a console application using Microsoft ASP.NET Web API self hosting and serves an image (with a delay) that is accessed by the other…

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• C# 4.0: Alternative To Optional Arguments

  - by Paulo Morgado

  Like I mentioned in my last post, exposing publicly methods with optional arguments is a bad practice (that’s why C# has resisted to having it, until now). You might argument that your method or constructor has to many variants and having ten or more overloads is a maintenance nightmare, and you’re right. But the solution has been…

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• C# 4.0: COM Interop Improvements

  - by Paulo Morgado

  Dynamic resolution as well as named and optional arguments greatly improve the experience of interoperating with COM APIs such as Office Automation Primary Interop Assemblies (PIAs). But, in order to alleviate even more COM Interop development, a few COM-specific features were also added to C# 4.0. Ommiting ref Because of a…

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• NHunspellToolTip- A Spellchecking ToolTip using Hunspell for .NET

  This ToolTip will allow you to spell-check the text of items or controls when you can't see the whole text.

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• The Evolution Of C#

  - by Paulo Morgado

  The first release of C# (C# 1.0) was all about building a new language for managed code that appealed, mostly, to C++ and Java programmers. The second release (C# 2.0) was mostly about adding what wasn’t time to built into the 1.0 release. The main feature for this release was Generics. The third release (C# 3.0) was all…

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• C# 4.0: Covariance And Contravariance In Generics Made Easy

  - by Paulo Morgado

  In my last post, I went through what is variance in .NET 4.0 and C# 4.0 in a rather theoretical way. Now, I’m going to try to make it a bit more down to earth. Given: class Base { } class Derived : Base { } Such that: Trace.Assert(typeof(Base).IsClass && typeof(Derived).IsClass &&…

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• C# 4.0: Covariance And Contravariance In Generics

  - by Paulo Morgado

  C# 4.0 (and .NET 4.0) introduced covariance and contravariance to generic interfaces and delegates. But what is this variance thing? According to Wikipedia, in multilinear algebra and tensor analysis, covariance and contravariance describe how the quantitative description of certain geometrical or…

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• LINQ: Enhancing Distinct With The PredicateEqualityComparer

  - by Paulo Morgado

  Today I was writing a LINQ query and I needed to select distinct values based on a comparison criteria. Fortunately, LINQ’s Distinct method allows an equality comparer to be supplied, but, unfortunately, sometimes, this means having to write custom equality comparer. Because I was going to need…

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• TechDays 2010: What’s New On C# 4.0

  - by Paulo Morgado

  I would like to thank those that attended my session at TechDays 2010 and I hope that I was able to pass the message of what’s new on C#. For those that didn’t attend (or did and want to review it), the presentation can be downloaded from here. Code samples can be downlaoded from here. Here’s…

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• Microsoft VEMap Using Pure Javascript

  The article will guide you with samples to create and embed Microsoft Map in your website within minutes. The intension is to give basic knowledge on how Javascript library could be used to embed Custom Map

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• LINQ: Single vs. SingleOrDefault

  - by Paulo Morgado

  Like all other LINQ API methods that extract a scalar value from a sequence, Single has a companion SingleOrDefault. The documentation of SingleOrDefault states that it returns a single, specific element of a sequence of values, or a default value if no such element is found, although, in my…

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• Callback Contract in WCF

  Callback contracts are a very powerful concept that is easily implemented in WCF. Using this, it is very easy to achieve event-like behavior between a service and client (duplex operations).

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• Creating Property Set Expression Trees In A Developer Friendly Way

  - by Paulo Morgado

  In a previous post I showed how to create expression trees to set properties on an object. The way I did it was not very developer friendly. It involved explicitly creating the necessary expressions because the compiler won’t generate expression trees with property or field set expressions. …

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• Asynchronous Streaming in ASP.NET WebApi

  - by andresv

   Hi everyone, if you use the cool MVC4 WebApi you might encounter yourself in a common situation where you need to return a rather large amount of data (most probably from a database) and you want to accomplish two things: Use streaming so the client fetch the data as needed, and that…

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• LINQ: Enhancing Distinct With The SelectorEqualityComparer

  - by Paulo Morgado

  On my last post, I introduced the PredicateEqualityComparer and a Distinct extension method that receives a predicate to internally create a PredicateEqualityComparer to filter elements. Using the predicate, greatly improves readability, conciseness and expressiveness of the queries, but it…

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• Use VS2010 to deploy your SQL Database

  - by mcp111

  Did you know? You can use VS2010 to deploy your SQL databases. To access the deployment tool in Visual Studio 2010 you must first navigate to the project's properties window and find the Package/Publish SQL tab, located just below the Package/Publish Web tab. Here you will find most…

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• Win 2 years free web hosting for your site!!!

  - by mcp111

  EggHeadCafe is giving away a free 2 year Personal Class Account to Arvixe ASP.NET Web Hosting! In fact, all members who enter the drawing below win a 20% discount off a Personal Class Account. The nice thing about Arvixe is that they also accept Google checkout and Paypal.…

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• Hash Function Added To The PredicateEqualityComparer

  - by Paulo Morgado

  Sometime ago I wrote a predicate equality comparer to be used with LINQ’s Distinct operator. The Distinct operator uses an instance of an internal Set class to maintain the collection of distinct elements in the source collection which in turn checks the hash code of each…

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• IIS7Register failed with HRESULT 800700b7: 'Cannot create a file when that file already exists.'

  - by Optimax

  I am trying to re-install ASP.NET on IIS7 running in Win7/64, which magically stopped working all of as sudden. When I run aspnet_regiis -i, I get an error message that says Finished installing ASP.NET (4.0.30319). Setup has detected some errors during the operation.…

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• How do I get a .Net 4.0 app to coexist as an application under a SharePoint 2007 website in IIS v7?

  - by Craig Nakamoto

  I have created a small .Net 4.0 website and installed it on my SharePoint server as a separate web site in IIS v7 (using port 8008 for now). I had to install the .Net 4 framework, set up the database, etc. and this all went smoothly and my app works as a standalone…

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• Is there a .NET 4.0 offline install?

  - by TrueWill

  I'm trying to install .NET 4.0 on some VMs using dotNetFx40_Full_setup.exe and am getting error 0x800C0005. The issue likely involves the firewall/proxy/security configuration. Rather than dealing with that, does Microsoft have an offline install available yet? I've…

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