Create a login page using visualforce with apex error message.

public class loginPageController {

    public list res {set;get;}

    public string resName{set;get;}

    public string firstName{set;get;}

    public string LastName {set;get;}

    public string password {set;get;}

    public string reTypePassword {set;get;}

    public string phone {set; get;}

    public string Email {set;get;}

    public loginpage(){

      res= new list();

    }

    public pagereference getpage(){

        res=[select name,FirstName__c,LastName__c,password__c,Retype_Password__c,phone__C,Email__C from Registration__c where Email__C=:Email];

        if(Email != null && res.size()>0){

            apexpages.Message mes= new apexpages.Message(apexpages.Severity.ERROR,'Please check your username and password');

            apexpages.addMessage(mes);

            return null;

        }else{

            Registration__c r = new Registration__c();

            r.Name=resName;

            r.lastName__c=LastName;

            r.FirstName__c=firstName;

            r.Email__c=Email;

            r.Retype_Password__c=reTypePassword;

            r.Password__c=Password;

            r.Phone__c=phone;

            insert r;

        pagereference p = new pagereference('/'+r.Id);

        return p;

    }

 }

 public pagereference GetRecord(){

      pagereference page = new pagereference('/apex/forgetLinkPage');

        return page;

    }

  public pagereference LadingHomePage(){

      pagereference hpage = new pagereference('/apex/Ladingpage');

      return hpage;

    }

   public pagereference HomepageEnter(){

        pagereference newpage = new pagereference('/apex/NewHome');

        newpage.setRedirect(true);

        return newpage;

   }

}

          Name

          Last Name:

          First Name:

          Phone:

          Email:

          Password:

          Retype password: