Why isn't my PHP SHA256 hash equivalent to C# SHA256Managed hash

Question

Why aren\'t these the same?

php:

    $hash = hash(\'sha256\', $userData[\'salt\'] . hash(\'sha256\', $password) );

c#

Answer 1

Well I'm no C# programmer, but one thing that leaps out at me is this:

// Convert result into a base64-encoded string.
string hashValue = Convert.ToBase64String(tHashBytes);

Are you base64-encoding the final output in C#? Because you're not in PHP...