Use of var and default for declaration in C#

Question

Recently I saw a person heavily using var and default keywords for declaration of variables (and for every declaration), something like this:

var employee = default(Employee);   //Employee is a class
var errorInfo = default(ErrorInfo); //ErrorInfo is struct; Blank is default value
var salary = default(Double);
var isManager = default(Boolean?); 

instead of using:

Employee employee = null;           //Employee is a class
ErrorInfo errorInfo = Blank;        //ErrorInfo is struct; Blank is default value
Double salary = 0.0;
Boolean? isManager = null;

or, instead of using even:

Employee employee;                  //Employee is a class
ErrorInfo errorInfo;                //ErrorInfo is struct; Blank is default value
Double salary;
Boolean? isManager;

Now using var and default for declaration for every variable is something i am not accustomed to.

Want to know:
- If this is a recommended practice?
- Your views and preference?

PS:
- Have gone through Use of var keyword in C#, Use of "var" type in variable declaration and https://stackoverflow.com/questions/633474/c-do-you-use-var, however, think that this question although related is slightly different as it is solely around declaration/initialization and not around assignment.
- I understand the difference between snipped 2 and snippet 3. However, question is more around snippet 1.
- If you strongly feel that this question belongs to programmers stackexchange feel free to move.

Answer 1

I'm not going to say anything about "var" there have been comments and discussions about this in the past (sufficiently so ;-)

Concerning "default()" I would not use this to initialize a known type, but rather only in generics. There it helps to transparently handle value types or reference types by allowing you to provide a default (return) value or can be used in comparisons.