CONSOLE CLASS STATIC METHODS,IDENTITY FUNCTION IN SQL

Question

Can anyone please provide me the information regarding

a) Differences between WriteLine() and Write() 

b)Differences between ReadLine() and Read()  

c)Differences between ReadLine() and ReadKey()

 

Provide the information regarding:

SQL IDENTITY FUNCTION:

A) Setting Identity function in SQL explicitly using the syntax

set Identity_Insert <Table Name> ON/OFF