Dictionary comprehension in C#

gistfile1.cs

// Initial version w/ explicit types:
Dictionary<string, string> users = db.Users.Where(u => u.Account.Id == accountID).ToDictionary<User, string, string>(u => u.Id.ToString(), u => u.Login.Username);

// Without explicit type info.
var users = db.Users.Where(u => u.Account.Id == accountID).ToDictionary(u => u.Id.ToString(), u => u.Login.Username);