how to pass value from controller to gsp page

Question

i want to pass the value of i to create .gsp page ,how to do that

def save = {
    def billingPeriodInstance = new BillingPeriod(params)
    DatabaseImpController obj= new DatabaseImpController()

   int i = obj.setbillPeriod()

   if(i== 1){
        render(view: "create")
   }
}

Answer 1

just use

render(view: "create", model:[i: i])