net2.0 How to modify the resolution of a user's password

Solve

In net2.0 Memebershipuser class has a ChangePassword method, but he has two parameters, old password and new password, but the problem is ah, how do I know the user's old password ah, if I do as an administrator to modify the user password, the solution is as follows, first to the user Resetpasswo RD Code:

MembershipUser user = Membership.getuser (txtFindUserName.Text.ToString (). Trim ());
User. Unlockuser ();
String oldpass = user. ResetPassword ();
String newpass = TxtFindUserPass.Text.ToString (). Trim ();
if (Newpass.length < 6)
{
Return
}
User. ChangePassword (Oldpass,newpass);