'SHA256 Hashing with Salt in PHP not same as in C#

So I got an ASP.NET web app which uses hashing with salt to store password in mysql database. I am now trying to allow user to login with the same credentials as my web app through a php website. I used the following code to compare user input and hash in php

$pw = $salt . $extpassword;
if (!mb_check_encoding($pw, 'UTF-8')) {
    $pw = mb_convert_encoding($pw, 'UTF-8');
}

return ($fromdb == base64_encode(hash('sha256',$pw, true)));

As for my code in c# used to generate hash:

System.Security.Cryptography.SHA256Managed sha256 = new System.Security.Cryptography.SHA256Managed();
byte[] hash = sha256.ComputeHash(System.Text.Encoding.UTF8.GetBytes(pw + salt)); 
return Convert.ToBase64String(hash);

I am not sure why this wouldn't work as I'm completely new to php. Can anyone please help?

c++sharpphpasp.net


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