What is var?

Answer:

Var is used to declare implicitly typed local variable means it tells compiler to figure out the type of the variable at compile time.
Since, 'var' is anonymous type, hence it is used where we don't know the type of output like joining of two tables.

var q = (from e in tblEmployee
join d in tblDepartment
on e.DeptID equals d.DeptID
select new
{
e.EmpID, e.FirstName, d.DeptName
});