C# Questions and Answers – Part 3

What is an anonymous class?
An anonymous class is a class that does not have a name. An anonymous class created by using the new keyword and and a pair of brace defining the fields and values.

How to prevent a calculation overflowed in C#?
Use checked keyword. For example: checked (operand1 + operand2); checked and unchecked keyworks are for integer arithmetic such as int and long

What is a partial class?
When we split a number of methods, fields, and constructors of a class into many files, we can use partial keyword.

Previous posts:
C# Questions and Answers
C# Questions and Answers – Part 2
C# Questions and Answers – Part 3

Notes on MVC Music Part 7 Tutorial

When using Visual Studio 2012 and MVC 3 to practice the MVC Music Store tutorial, you may get this error on part 7:
‘CompareAttribute’ is an ambiguous reference between ‘System.ComponentModel.DataAnnotations.CompareAttribute’ and ‘System.Web.Mvc.CompareAttribute’

Here is the solution:
Remove the reference using System.Web.Mvc;
from MvcMusicStore\Models\AccountModels.cs

C# Questions and Answers – Part 2

What is a constructor?
A constructor is a special method with the same name as the class. It is executed when an instance of the class is created and can contain code to initialize the instance.
What is the difference between public, static and void?
All these are access modifiers in C#. Public declared variables or methods are accessible anywhere in the application. Static declared variables or methods are globally accessible without creating an instance of the class. Void specifies that the method does not return a value.
What is an interface?
An interface contains only the signatures of methods, delegates or events. The implementation of the methods is done in the class that implements the interface. Read more http://msdn.microsoft.com/en-us/library/87d83y5b(v=VS.80).aspx
What is a delegate?
Delegate is a reference type that can be used to encapsulate a named or an anonymous method. Delegates are similar to function pointers in C++; however, delegates are type-safe and secure. Read more http://msdn.microsoft.com/en-US/library/900fyy8e(v=vs.80).aspx

Previous posts:
C# Questions and Answers
C# Questions and Answers – Part 2
C# Questions and Answers – Part 3

Notes on MVC Music Part 3 Tutorial

MVC Music Store is a great tutorial written by Jon Galloway. Using Visual Studio 2012 with MVC 4 Web Application Empty template, the following folders are note available:

• /View/Shared
• /Content/
• /Scripts

Here are solutions:

1. Drag /Content folder from MVCMusicStore-Assets.zip into MvcMusicStore solution folder in Visual Studio 2012. If you just drag and drop in Windows Explorer, make sure it 'included in the project'
2. Select Manage Nuget Packagse under Project menu to install jQuery. The /Scripts folders will create under MvcMusicStore folder.
3. Add folder Shared to /View folder
4. Right click on /View/ folder to add MVC 4 Layout page (Razor) and named it _Layout.cshtml. Copy the code in tutorial into this file. Also correct version of installed jQuery script. Here, I used jquery-2.0.0.min.js instead of jquery-1.5.1.min.js
5. Right click on /View/Shared folder to add MVC 4 Layout page (Razor) and named it _ViewStart.cshtml. Added the following codes to this file:
   @{
Layout = "~/Views/Shared/_Layout.cshtml";
}

C# Questions and Answers

What are namespaces?

Namespaces are heavily used in C# programming in two ways. First, the .NET Framework uses namespaces to organize its many classes. Second, declaring your own namespaces can help you control the scope of class and method names in larger programming projects. Use the namespace keyword to declare a namespace

Namespaces have the following properties:

• They organize large code projects.
• They are delimited by using the . operator.
• The using directive obviates the requirement to specify the name of the namespace for every class.
• The global namespace is the "root" namespace: global::System will always refer to the .NET Framework namespace System.

Read more at MSDN: Namespaces (C# Programming Guide)

Namespaces are a way of grouping type names and reducing the chance of name collisions. A namespace provides a fundamental unit of logical code grouping.
( Understanding and Using Assemblies and Namespaces in .NET )

What is the GAC?

GAC stands for global assembly cache. It is a machine-wide common language runtime code cache. The global assembly cache stores assemblies specifically designated to be shared by several applications on the computer.

Read more at MSDN: Global Assembly Cache

What is a class?

A class is a construct that enables you to create your own custom types by grouping together variables of other types, methods and events. A class is like a blueprint. It defines the data and behavior of a type.

For more information, see MSDN: Classes (C# Programming Guide).
Previous posts:
C# Questions and Answers
C# Questions and Answers – Part 2
C# Questions and Answers – Part 3