Using SecureString

Can this be simplified to a one liner? Feel free to completely rewrite it as long as secureString gets initialized properly.

SecureString secureString = new SecureString ();
foreach (char c in "fizzbuzz".ToCharArray())
{
    secureString.AppendChar (c);
}

Just use NetworkCredential. It has the conversion logic built-in.

SecureString ss = new NetworkCredential("", "fizzbuzz").SecurePassword;

As others have noted, all of these techniques strip the security benefits of SecureString, but in certain situations (such as unit tests) this may be acceptable.

Update:

As noted in the comments, NetworkCredential can also be used to convert a SecureString back to a string.

string s = new NetworkCredential("", ss).Password;

You could use Linq:

"fizzbuzz".ToCharArray().ToList().ForEach(p => secureString.AppendChar(p));

Apart from using unsafe code and a char*, there isn't a (much) better way.

The point here is not to copy SecureString contents to/from normal strings. The constant "fizzbuzz" constant is the security leak here.