2009

Using Windows Azure BLOB storage with PHP

My last posting described how to read and write files located in Windows Azure cloud storage. In this posting I will show you how to do almost same thing using PHP. We will use Windows Azure SDK for PHP. The purpose of this example is to show you how simple it is to use Windows Azure storage services in your PHP applications.

Windows Azure – Using DataSet with cloud storage

On Windows Azure CTP some file system operations are not allowed. You cannot create and modify files located on server hard disc. I have small application that stores data to DataSet and I needed place where I can hold this file. The logical choice is cloud storage service of course. In this posting I will show you how to read and write DataSet to your cloud storage as XML-file.

ASP.NET MVC: Creating reports using Chart control

ASP.NET Chart control is powerful control you can use to add charting support to your web applications. Although chart controls are mainly used with ASP.NET forms it is not very hard to use them also in ASP.NET MVC applications. In this posting I will show you how to use ASP.NET Chart control in ASP.NET MVC application and I will illustrate how to do it easily so you don’t mess up your views.

ASP.NET 4.0: Writing custom output cache providers

Until now we can use ASP.NET default output cache. We don’t have any option to write our own output cache mechanisms. ASP.NET 4.0 introduces extensible output cache – programmers can write their own output cache providers. In this posting I will show you how to write your own output cache provider and give you my sample solution to download.

ASP.NET MVC: Validating objects using Enterprise Library validation application block

Data validation is important topic in applications. There are many validation frameworks available and there should be one that you are happy with. I am currently playing withEnterprise Library 4.1 Validation Application Block and I am integrating it to my ASP.NET MVCapplication. In this posting I will show you how to use validation block in your ASP.NET MVC application.

Visual Studio 2010: UML modeling projects

Visual Studio 2010 introduces modeling projects that bring UML diagrams to Visual Studio. Currently it is not possible to generate classes from diagrams automatically but I don’t think it is a problem – good UML diagrams visualize different aspects of system short and clearly and they usually don’t document everything you can find in system. In this posting I will show you how to use modeling projects in Visual Studio 2010.

Using ASP.NET and Jcrop to crop images online

Cropping images in ASP.NET is easy task to do if you use right tools. In this posting I will introduce how to crop images using Jcrop and System.Drawing namespace classes. What we are building is simple and user-friendly image cropping interface that also demonstrates some simple features of Jcrop. Believe me, your users will love it!

.Net Framework 4.0: VB.NET supports automatic properties

Next version of .Net Framework brings some new features also to VB.NET. One of those new features is support for automatic properties. C# automatic properties are here from .Net Framework 3.5 and now are them also in VB.NET. In this posting I will show to VB.NET users how to use automatic properties and explain why […]

Writing cache based repositories for web application prototyping

When I started building in-house demo application I thought about how to solve temporary data layer so I don’t have to use real database and object mappings for it. Playing with new object model and new components I move way faster if I don’t have any additional ballast that I can avoid. So I wrote simple cache based repository mechanism I can use to imitate real repositories that I will write in the future.

.Net Framework 4.0: Enumerating file system objects

In my last posting I introduced new ReadLines() method and new overloads for WriteAllLines() method of File class. But there are more new stuff in System.IO namespace. In .Net Framework 4.0 Directory and DirectoryInfo class are able to enumerate files, directories and file system entries. In this posting I will show you these new features.

.Net Framework 4.0: System.IO.File supports now IEnumerable

.Net Framework 4.0 adds also some new and cool features to file system objects. File class has now ReadLines() methods that returns IEnumerable. WriteAllLines() methods has two overload methods that accept IEnumerable instead of strings array that was also supported in previous versions of .Net Framework. This posting introduces ReadLines() and WriteAllLines() methods and gives you some ideas how to use these methods in your applications.

.Net Framework 4.0: string.IsNullOrWhiteSpace() method

.Net Framework 4.0 Beta 2 has new IsNullOrWhiteSpace() method for strings generalizes IsNullOrEmpty() method to incluse also other white space besides empty string. In this posting I will show you simple example that illustrates how to use IsNullOrWhiteSpace() method.

.Net Framework 4.0: Complex numbers

.Net Framework 4.0 Beta 2 introduces new class in System.Numerics namespace: Complex. Complex represents complex numbers and enables different arithmetic operations with complex numbers. In this posting I will show you how to use complex numbers in .Net Framework 4.0 applications.

My MVP continued!

Couple of days ago I got e-mail with good news: my ASP/ASP.NET MVP status continues! I am really glad because Microsoft finds my public activities good enough and it gives me certainty that I am moving the right way.

IIS won’t start – Error 13: The data is invalid.

After restarting my virtual development machine IIS was not able to start anymore. I checked out if there is something reported to Event Viewer and I found the following error message –Error 12: The data is invalid. It turned out that during shutdown of my virtual machine IIS config file was ruined. Solution to my problem was very simple.

Creating squared avatar images

In one of my current projects I needed something that takes image uploaded by user and converts it to avatar image. There is requirement for avatar images: they must be 32×32 pixel squares. Here is my solution.

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