c# - SHA256.Create() always returns null -

whenever use sha256.create() method returns null value. here method have encrypting password ...

private string encryptpassword(string password) {     sha256 sha = sha256.create(password);     return bitconverter.tostring(sha.hash); }

the debugger shows variable sha null. have tried putting in own method in controller still system.nullreferenceexception

public string index() {     return bitconverter.tostring(sha256.create("hello world").hash); }

i lost. there doing wrong?

yes, create() isn't meant message, specifies sha256 implementation.

i suspect want use implementation class sha256managed instead.

example:

using (var sha256 = new sha256managed()) {     byte[] raw = encoding.default.getbytes(password);     return sha256.computehash(raw); }

Funaction