What is Inversion of control and why we need it?

Most of programmer need inversion of control pattern in today’s complex real time application world. So I have decided to write a blog post about it. This blog post will explain what is Inversion of control and why we need it. We are going to take a real world example so it would be better to understand.

The problem- Why we need inversion of control?

Before giving definition of Inversion of control let’s take a simple real word example to see why we need inversion of control. Please have look on the following code.

public class class1
{
    private class2 _class2;

    public class1()
    {
       _class2=new class2();
    }

}
public class class2
{
     //Some implementation of class2
}

I have two classes “Class1” and “Class2”.  If you see the code in that I have created a instance of class2 class in the class1 class constructor. So the “class1” class is dependent on “class2”. I think that is the biggest issue in real world scenario as if we change the “class2” class then we might need to change the “class1” class also. Here there is one type of dependency between this two classes that is called Tight Coupling. Tight coupling will have lots of problem in real world applications as things are tends to be change in future so we have to change all the tight couple classes that are dependent of each other. To avoid this kind of issue we need Inversion of control.

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IUnlockJoy I build amazing Windows Phone Apps event –11th August rocks!!

Last Saturday ,11^th August Microsoft and Ahemdabad .NET user group has organized the IUnlockJoy I build amazing Windows Phone Apps  event. It was first in india as IUnlockJoy campaign was just launched by Microsoft before 3 days. It was superb and well organized thanks to Dhola Mahesh, Prabjhot Baxi,Kaushal Bhavasar and Pranjal Nigam.

It was a great event with almost 100+ people during holiday. Event was started by a keynote speaker Mahesh Dhola. He introduced IUnlockJoy- I build amazing Windows Phone Apps campaign and some of benefits of it.




After his session Prabjhot singh Baxi has taken a session about how you can get best out of windows phone. He has describe all the process from opening a developer account to publish an app to market place. The session was full of information and I really enjoyed it.

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Multiple file upload with asp.net mvc and HTML5

Few days I have written a blog post about Multiple file upload with asp.net 4.5 and Visual studio 2012. It was greatly appreciated by the community and also been part of www.asp.net community daily spot light.  On that post one of my reader Ciwan Kurd has requested the asp.net mvc version of that post. So in this post I will explain how we can do multiple file upload with HTML5.

For this post I am going to use asp.net mvc 3 with HTML5 template and visual studio 2012 but you can use same techniques in any version of asp.net mvc.  First things we needs to do create a HTML form for the uploading file in asp.net mvc view so following is a code for that.

@using (Html.BeginForm("Upload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{ 
    <label for="file">Upload Image:</label>
    <input type="file" name="files" value="" multiple="multiple"/>
    <input type="submit" value="Upload Image" />
}

In above code that I have use @HTML.BeginForm to create a HTML form with multipart as this attribute is required to upload any kind of files on the server. I have mapped that form to upload action result. Also I have used the file input control with HTML5 multiple attribute which allow us to upload multiple files on the server. Now its time to write code in asp.net mvc controller. Following is a code for that.

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