password hashing c# windows app, absent asp.net's formsauthentication?

my win form app doesn't seem formsauthentication, i'm totally new hashing any assistance modify unequivocally welcome. thanks.

//write hash
protected textbox tbpassword;
protected verbatim lihashedpassword;

{
  twine strhashedpassword = formsauthentication.hashpasswordforstoringinconfigfile(tbpassword.text, "sha1");
  lihashedpassword.text = "hashed evidence is: " + strhashedpassword;    
}

//read hash
string struserinputtedhashedpassword = formsauthentication.hashpasswordforstoringinconfigfile( tbpassword.text, "sha1");
if(struserinputtedhashedpassword == getusershashedpasswordusingusername(tbusername.text))
{
  // sign-in successful
}
else
{
  // sign-in failed
}