//Replace Provider and ConnectionString with values from your App_Data\FileVista.config
var dataContext = new DataContext("Provider", "ConnectionString");

//Call this method with your own parameters for creating a user with a password:
dataContext.CreateUser(
    name, 
    fullName, 
    email, 
    description, 
    password, 
    passwordNeverExpires, 
    cannotChangePassword, 
    forceChangePassword, 
    isDisabled);

//If you want to mimic "Import Users" dialog behaviour on administration page 
//Note that no password is specified when importing a user because user will be
//authenticated against AD or Machine:
dataContext.CreateUser(
    name, 
    fullName, 
    email, 
    description, 
    userTpe //UserType.ActiveDirectoryDs or UserType.Machine
);

using GleamTech.Cryptography;

var hashedValue = CryptoManager.CreatePassword("plain password");