When should I use a static class in C#?

If a class is declared as static then the variables and methods should compulsorily be declared as static.

A class can be declared static, indicating that it contains only static members. It is not possible to create instances of a static class using the new keyword. Static classes are loaded automatically by the .NET Framework common language run time (CLR) when the program or namespace containing the class is loaded.

Use a static class to contain methods that are not associated with a particular object. For example, it is a common requirement to create a set of methods that do not act on instance data and are not associated to a specific object in your code. You could use a static class to hold those methods.

The main features of a static class are:

• They only contain static members.
• They cannot be instantiated.
• They are sealed.
• They cannot contain Instance Constructors or simply constructors as we know that they are associated with objects and operates on data when an object is created.

 

GET and POST to same Controller Action in ASP.NET MVC.

This is possible using the AcceptVerbs attribute. It’s a bit more verbose but more flexible.

[AcceptVerbs(HttpVerbs.Get|HttpVerbs.Post)]

public ActionResult Index()

{

                    // Code goes here

}

Difference between Get and Post Method in MVC

GET method is preferred to be for Read-only actions and Post method for actions that modify/manipulate the data. However, it’s just a best practice and even Get can be used to manipulate data.

The GET Method

It requests data from a specified resource.

Note that the query string (name/value pairs) is sent in the URL of a GET request:

/test/demo_form.aspx?name1=value1&name2=value2

Some other notes on GET requests:

• GET requests can be cached
• GET requests remain in the browser history
• GET requests can be bookmarked
• GET requests should never be used when dealing with sensitive data
• GET requests have length restrictions
• GET requests should be used only to retrieve data

The POST Method

It submits data to be processed to a specified resource.

Note that the query string (name/value pairs) is sent in the HTTP message body of a POST request:

POST /test/demo_form.aspx HTTP/1.1
Host: abc.com
name1=value1&name2=value2

Some other notes on POST requests:

• POST requests are never cached
• POST requests do not remain in the browser history
• POST requests cannot be bookmarked
• POST requests have no restrictions on data length

GET vs. POST

	GET	POST
BACK button/Reload	Harmless	Data will be re-submitted (the browser should alert the user that the data are about to be re-submitted)
Bookmarked	Can be bookmarked	Cannot be bookmarked
Cached	Can be cached	Not cached
Encoding type	application/x-www-form-url encoded	application/x-www-form-url encoded or multipart/form-data. Use multipart encoding for binary data
History	Parameters remain in browser history	Parameters are not saved in browser history
Restrictions on data length	Yes, when sending data, the GET method adds the data to the URL; and the length of a URL is limited (maximum URL length is 2048 characters)	No restrictions
Restrictions on data type	Only ASCII characters allowed	No restrictions. Binary data is also allowed
Security	GET is less secure compared to POST because data sent is part of the URL Never use GET when sending passwords or other sensitive information!	POST is a little safer than GET because the parameters are not stored in browser history or in web server logs
Visibility	Data is visible to everyone in the URL	Data is not displayed in the URL