C# 3.0 introduces implicitly typed variables, aka the "var" keyword.

var daysInAWeek = 7;
var paul = FindPerson("Paul");
var result = null as IPerson;

Others have asked about what it does or what the problems with it are:

• http://stackoverflow.com/questions/527685/anonymous-types-vs-local-variables-when-should-one-be-used
• http://stackoverflow.com/questions/209199/whats-the-point-of-the-var-keyword
• http://stackoverflow.com/questions/41479/use-of-var-keyword-in-c

I am interested in some numbers - do you use it? If so, how do you use it?

1. I never use var (and I never use anonymous types)
2. I only use var for anonymous types
3. I only use var where the type is obvious
4. I use var all the time!