Hash Table in C#

 The Hashtable is a non-generic collection and used to store the key/value pairs based on the hash code of the key. Key will be used to access the element in the collection.

Hashtable Characteristics

• Comes under System.Collection namespace
• Keys must be unique and cannot be null.
• Values can be null or duplicate.
• Values can be accessed by passing associated key in the indexer e.g. myHashtable[key]
• Elements are stored as DictionaryEntry objects.
• “ContainsKey” can be used to check the key in the hash table.

URL: https://dotnetfiddle.net/Tb8E69

Repeat character without loop in C#

 you can use string constructor that accepts a char and the number of times to repeat it.

Example:

public class Program
{
public static void Main()
{
string tabs = new String('X',  4);
Console.WriteLine(tabs);
}
}

OUTPUT:
XXXX

Right and Left padding in C#

Padding adds the space or any character to the right or left side.

PadRight: This method add the characters in right side and left align
PadLeft: This method add the characters in left side and right align

Readonly and Constant in C#

Constant: Constant fields are define at the time of declaration and once they are defined can't be changed.

NOTE:

1. This can't be declared static.
2. Local scope 
3. This is implicitly static variable.
4. This must to initialised

Readonly: Readonly can be initialised either at the time of declaration or within the constructor of the same class and change the value in the same class constructor.

Dictionary in C#

• Dictionary is generic collection and includes System.Collections.Generic namespace.
• This is collection of Key and value pair and key must be a unique.
• In the dictionary, you cannot be including duplicate key. 
• In the dictionary, duplicate key given run time error.

NOTE:

1. It returns error if we try to find a key which does not exist.
2.  It is faster than a hash table because there is no boxing and unboxing.
3. Dictionary is a generic type which means we can use it with any data type.

List<T> in C#

List

• Lists are strongly typed generic collections.
• They will store values of different or same datatype.
• List size will increase or decrease dynamically.
•  Its defined in the System.Collections.Generic namespace

      Add item in List :

What is AngularJS?

• AngularJS is an open source JavaScript MVC framework for web applications.
• AngularJS extends Html behavior by creating custom tags or adding attributes in tags.
• AngularJS can be used to create Single Page Applications (SPA).

  Some of the reasons why I would prefer AngularJS:

• You can create a template and reuse it in application multiple times.
• You can bind data to any element in two ways, where two-way actually means changing data will automatically change element and changing element will change the data.
• You can directly call the code-behind code in your html.You can validate forms and input fields before submitting it without writing a single line of code.
• Allows you to control complete DOM structure show/hide, changing everything with AngularJS properties.
• AngularJS allows you to write basic flow end-to-end testing, unit-testing, UI mocks.

AngularJS provides all the features you need to build a CRUD application like data-binding, data validation, url routing, reusable HTML components and most importantly dependency injection.

Use get method in $http

Keeps JSON object name same as .net class property name

Post method in angularjs by using $http with parameters

 

Call WebAPI/Controller and Post the object.