Reference types are always passed by reference so what’s the difference between passing a reference type by value or by ref keyword. Let’s try to understand by some code samples:
Let’s say we have a class MyClass defined below, Class in .Net is a reference type as you should know.
class Reftype { public int i; }
Value type vs Reference type .net
.Net types are broadly classified into 2 categories based on storage:
Values types are allocated on Stack whereas reference types are allocated on Heap. Continue reading
Q.) What are patterns ?
Ans.) Patterns are building blocks of software architecture.
Q.) What are anti-patterns?
Ans.) Wrong or half cooked solutions which have been accepted widely as solutions to a known problem are called anti-patterns. Continue reading
Web forms uses page controller or base controller design pattern where as MVC uses Front Controller design pattern.
Page Controller:
Page receives request from IIS and call controllers method. In traditional web forms all pages (View) inherit from System.Web.UI.Page class which has a code behind class acting as a controller. Continue reading
Actions in Asp.Net MVC returns ActionResult which is base class for all the results that can be returned. Below are classes that derive from ActionResult and can be returned as a result.
.Net provides low level classes to natively work with HTTP. Two of such classes worth mentioning are:
To send a request to target URL we will create an instance of HttpWebRequest as follows: Continue reading
const are compile time constants where as readonly are runtime constants. Once assigned you cannot change the values assigned to variables declared as const or readonly.
Usage:
Const variable just like their static(shared in VB) counterparts are accessible via Class Names only. They are not accessible via objects.
Readonly variable are instance variable and accessible via objects. Continue reading
HttpRequest and HttpResponse Classes
Let’s try to scrape from data from my own blog i.e. www.shaktitanwar.com . We will try to extract all blog titles on home page.
There are various facets to scraping:
Automating applications is a serious business. Most business requires data coming from various sources. Usually there are 2 techniques that are used to fetch data from sources:
1.) Calling Provider API :
This is a White hat approach of getting data from data sources. Continue reading
Introduction
OOPS or Object Oriented Programming Structures. Some of the concepts have been always used in one or the other programming languages. For example you must have used structs in C which is a good example of encapsulation. There are four major pillar of OOPS. Let’s try to understand each one of them by taking some examples also:-
1.) Encapsulation
2.) Abstraction
3.) Polymorphism
4.) Inheritance
How to add modules in Visual Studio
Let’s try to add a new module express which is used to create MVC application using Node.To add a new module, we have 2 options:Using
1.) Node.js command line tool:
Navigate to project Root in command window.
Run below command:
Npm install express
Understanding Node.Js Project Structure in Visual Studio
Let’s create a new project in visual studio using Blank Node.js Console application template
Node.Js Support in Visual Studio
Visual Studio supports Node.js development. You can download node.js tools for visual studio (NTVS) from below location
Installation
Node.js can be installed from below link
https://nodejs.org/
Creating a Simple Server in Node.js Continue reading
Node.Js
On popular demand from many of my student and fellow developers, I am starting this series on Node.js . Focus will be on developing Node.js applications using Visual studio and side by side explaining things about other open source frameworks that go hand in hand with Node e.g. Bower, Grunt, Yeoman, Jasmine etc.
What is Node.js?
Node.js is a server side JavaScript framework. A server side framework means not only web framework like PHP,Asp.net but also something using which you can create your own servers like Apache or IIS. Using Node.js we can create networking applications on server as well. Unlike some other frameworks Node.js is completely Open source. Continue reading
Scaffolding Enhancements
Scaffolding is a feature through which we can generate code automatically using some predefined templates. Asp.Net MVC has built in scaffolding support and feature has been enhanced in MVC 5 by introduction of New Scaffold Menu item.
Let’s try to generate a controller for an existing Model class
public class PersonModel
{
[Key]
public int PersonId { get; set; }
public string PersonName { get; set; }
public int PersonAge { get; set; }
}Authentication Filters
One of a very common question asked in interview is difference between Authentication and Authorization.
Authentication is Who all are allowed to enter site.
Authorization is What all they are allowed to access once they have entered the site.
Before MVC 5 we already had Authorization Filters which we use to control access to resources i.e. whether the current user principle has access to requested resource on server. Continue reading
Override Fiters
Asp.net MVC 5 provides a way to control which filter applies to which controller or action methods. This can be achieved using Override Filters.
As you might be aware that Filters can be applied to controllers or Actions or Global level. We can apply filters at higher levels usually globally or at controller level and then depending on use we can override them at a lower level i.e. Controller and Action respectively.
Let’s apply Authorize attribute which is an Authorization Filter at Global Level.
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new AuthorizeAttribute(){Roles = "Member"});
}Attribute Based Routing:
Routing is a process of mapping a virtual or nonexistent URL to a physical resource on server. Url Routing is not a new feature and traces of routing were always available in asp.net web forms from version 2.0.
If you have worked on web forms in asp.net 2.0 than you must remember the attribute called UrlMapping in web.config. Just to recap how that worked
<system.web>
<urlMappings>
<add url="~/cricket" mappedUrl="~/Home/Cricket.aspx"/>
</urlMappings>
</system.web>
Route Attribute on Action
[Route("Sports/{category}")]
public ActionResult SomeAction(string category)
{
ViewBag.category = category;
return View();
}
[Route("Sports/{category}/edit")]
public ActionResult SomeMoreAction(string category)
{
ViewBag.category = category;
return View();
}