public class Registration{
 private static string PORTAL_ACCOUNT_ID = '0019000001dNRMn';
 public blob imagebody{get;set;}
public string firstname{get;set;}
public string lastname{get;set;}
public string email{get;set;}
public string username{get;set;}
public string password{get;set;}
public string confirmpassword{get;set;}
 private boolean isValidPassword() {
        return password == confirmPassword;
    }

public Registration(){
}

public void rigist(){

if (!isValidPassword()) {
           ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.ERROR,
               Label.site.passwords_dont_match);
           ApexPages.addMessage(msg);
           // return null;
        }

 User u = new User();
        u.Username = username;
        u.Email = email;
      //  u.CommunityNickname = communityNickname;

        String accountId = PORTAL_ACCOUNT_ID;
String userId = Site.createportaluser(u, accountId, password);
        if(userId != null) {

            if (password != null && password.length() > 1) {
              //  return Site.login(username, password, null);
            }
            else {
                PageReference page = System.Page.SiteRegisterConfirm;
                page.setRedirect(true);
               // return page;
            }
        }
      //  return null;
}

}