What is Scalability
Ability of a system, network or a process to handle growing amount of work in a capable manner. Scalability is important to make sure heavy loads that comes to the servers are handled without minimum or no downtime.
Types of scalability
Horizontal scaling (Scale out)
Adding more nodes to a system.
Scaling out with Azure SQL Database using Elastic Database.
Vertical...
Saturday, January 25, 2014
Model Binding in ASP.NET MVC
ASP.NET MVC Model Binding simplifies controller actions by automatically populating controller action parameters, taking care of property mapping and type conversion.
Model binding consists of collecting values from the request and populating models with those values. These steps are accomplished by value providers and model binders.
Value Providers
ASP.NET MVC includes value provider...
Wednesday, January 8, 2014
All about HTML5
Creating the document structure with HTML5 elements
Media controls in HTML5
Using Canvas and SVG
Styling HTML5 elements
Using HTML5 APIs (Storage APIs, AppCache API and Geolocation API)
Scopes in JavaScript
this in JavaScript
DOM Events
Exception Handling in JavaScript
WebSockets in HTML5
Web Workers in HTML5
...
Monday, January 6, 2014
All about ASP.NET MVC
Today I thought of categorizing the articles I'm going to write regarding ASP.NET MVC. Wrote them down on my whiteboard so I can see clearly what are they. Here are links to already written articles.
Introduction
MVC Framework and Application structure
Essential features
Global.asax
All about Context
Security
Identity Systems in ASP.NET...
Wednesday, January 1, 2014
Overloading, Overriding and hiding in C#
Overloading and overriding are concepts in polymorphism.
Overloading
Use overloading when multiple methods has same purpose but there is more than one way to do. Overloaded methods have different parameters.
E.g:
void ReadXml(string fileName) { }
void ReadXml(Stream strm) { }
An alternative to method overloading is to use optional parameters.
public void Foo(int x = 1)
Also use named...
Strategy Pattern
Allows behavior of an algorithm to be selected at run time. The strategy pattern,
defines family of algorithms,
encapsulate each algorithm and
makes algorithms interchangeable
Following is an example of a implementing strategy pattern.
Therefore the host class (The class that uses strategy, below the Context) class...
Using IComparer, Comparer and IComparer in C#
IComparer
IComparer interface exposes a method to compare two objects. This interface comes under System.Collections namespace. You can use this with Array.Sort() method. To use with Generic classes you must use IComparer<T> interface.
You can check the example in MSDN documentation to see how to use IComparer with an Array.
IComparer<T>
This interface comes under System.Collections.Generic...
Using IComparable in C#
In case you want to compare 2 objects for sorting purpose you can use this interface. IComparable defines a type specific comparison method. Value types and classes can implement this interface.
Lets say you have a list of people and you want to sort it by age. You'll use Sort method comes with the list. Usually the Sort() method will use default comparer for the...
SQL Overview
Table, Fields and Rows
Table is a collection of data. It consists of fields. Field is a column in a table that contains data of the table. Record or row is individual entries containing data of a table.
SQL Constraints
Constraints are rules enforced on columns or tables. The idea is to increase accuracy and reliability of data.
Not null
Default
Unique
Primary Key
Foreign...
Unit Testing
What is Unit Testing?
Testing smallest testable parts of an application. Unit testing only consider about the unit under test. Later you can do integration testing to verify other parts of the application. Unit testing can be very time consuming thing and you need to understand not all flows might not get covered here. Unit testing can be done manually as well as can be automated.
Using...
Factory Pattern
Factory pattern is a creational design pattern. It allows creation of objects without exposing internal logic to client. It allows subclasses to decide which class to instantiate.
Let's look at how we can implement factory pattern.
This file contains bidirectional Unicode text that may be interpreted or compiled...
Event Handlers in jQuery
.on()
Attach event handler function to one or more events for the selected elements. Go through the Documentation for more information and some examples.
Before on(), there were few alternative functions in use such as bind(), live() and delegate(). See the comparison to get more info about when to use what.
...
Windows Identity Foundation
http://dotnetcodr.com/tag/claims/page/2/
How to create a Claim
Claim claim1 = new Claim("Name", "User1");
You can also use enumeration ClaimTypes offered by WIF to give name for the claim (This is not actually a enum. It is a static class with const fields).
Claim claim2 = new Claim(ClaimTypes.Country, "Sri Lanka");
You can create IIdentity object using...
Relationships in Entity Framework
In Entity Framework, an entity can be related to other entities through an association (relationship). The relationship may be governed by a referential constraint, which describes which end in the relationship is a principal role and which is a dependent role. Navigation properties provide a way to navigate an association between two entity types.
Every object can have a navigation property...
Overview of .NET Framework
Above diagram shows a high level overview of .NET framework
Managed code vs Un-managed code
Managed code : code that is executed directly by the CLR.
Un-managed code : Code that is directly executed by the operating system.
Covariance and contra-variance
http://www.indiabix.com/technical/dotnet/dot-net-framework/5
https://www.google.lk/search?q=covariance%20and%20contravariance
Resources
http://msdn.microsoft.com/en-us/library/vstudio/zw4w595w%28v=vs.110%29.aspx
Image...
SignalR Performance and Scalability
ASP.NET Core SignalR is a library by Microsoft (now opensource) which allows server to communicate with client side web apps asynchronously. Performance and scalabality is a major consideration developers needs to consider when developing applications.
Performance tips
Reduce SignalR message size
You can reduce this by reducing size of your...
Command Pattern
In
command pattern an object is used to represent and encapsulate (hide
information) all the information needed to call a method at a later
time.
We are not directly interact with the event receiver. Instead we use Command Objects to interact
Receiver : Has operations to be executed
Invoker : Calls command to carryout operations....
Common Stored Procedures in SQL Server
sp_executesql (link)
Executes a T-SQL statement or batch. This can contain embedded parameters
Difference between exec and sp_executesql
sp_getapplock (link)
Locking tables or stored procedure at the same time
MSSQL Tips - Prevent Multiple users from running same SQL Server Stored Procedure at the same time. Also look at Transactions.
There are many other database engine...
NoSQL databases
NoSQL provides an alternative way for storage and retrieval of data for relational databases.
NoSQL has,
a massive write performance compared to relational DBs
faster Key-value access
Due to its lack of structure, flexible schema and data types
Can use right data model for right problem with different data models and many.
Usually...
Data Compression
Data compression is the process of reducing size of a data file. Compression can be either lossy or lossless. In lossless the bits are reduced by identifying and eliminating statistical redundancy. Lossy compression removes unnecessary information.
HTTP compression (wiki)
HTTP data is compressed before it is sent from the server: compliant browsers will announce what methods are supported...
How MVC, MVP and MVVM patterns are related
MVC
MVC pattern stands for Model, View and Controller. This pattern is used to separate concerns of the application in to different layers
MVP
MVP pattern stands for Model, View and Presenter. It's a derivative of MVC. It is commonly used for user interfaces.
MVVM
MVVM pattern stands for Model, View and ViewModel. MVVM is also...
ASP.NET Performance
Profiling
You can profile server side using Glimpse. Check the tutorial on ASP.NET website. Other than Glimpse there are profilers like MiniProfiler. See Hanselman article about Glimpse.
Using Asynchronous Methods
.NET framework maintains a pool of threads that are used to service ASP.NET requests. When a request arrives, a thread from the pool is dispatched to serve the request. If...
Concepts in Windows Identity Foundation
WIF involves lot of related concepts.
IIdentity
Usually represents the user. This interface is implemented by GenericIdentity and WindowsIdentity classes.
Identity Objects encapsulates information about the user or the entity. It basically contains a name and an authentication type. The name can be user's name or Windows account. .All...
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Software Architect at Surge Global/ Certified Scrum Master
Experienced in Product Design, Software Engineering, Team management and Practicing Agile methodologies.
