To solidly rip off DotNetRocks … today’s installment of “Better Know a Framework’s Methods”, we bring you the Generate Password method of the Membership class in System.Web.Security namespace.

public static string GeneratePassword(
    int length, 
    int numberOfNonAlphanumericCharacters 
)

The method is clearly super simple to use, taking in an overall length of password and count of non-alphanumeric characters to seed the password with.
I am sure there are all sorts of pitfalls to using this; but frankly, for a fast solution to generating passwords for zip files… this fits the bill nicely.