global  class SampleBatch implements      Database.Batchable<SObject>,Database.Stateful {

    global integer count;
    global SampleBatch (){count =0;}
    //START
    global Database.QueryLocator start(Database.BatchableContext BC) {
        return Database.getQueryLocator(queryString);
    }

    //EXECUTE
    global void execute (Database.BatchableContext BC,List<sObject> scope){
     count++;
    }
    //FINISH
    global void finish(Database.BatchableContext BC){
    }


}