Sending Email with Attachment using Apex & Visualforce page

 Public with sharing class SendemailController{     public String caseId {get;set;}     Public SendemailController(){     caseId = ApexPages.currentPage().getParameters().get(‘Id’);     }     Public Pagereference sendEmailFunction(){     Case getEmail = [SELECT Id, Contact.Email FROM Case WHERE id=:caseId];     if(getEmail.Contact.Email != null) {     String toaddress = getEmail.Contact.Email;     try {     Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();     String[] toAddresses = new String[] {toaddress};     String[] ccAddresses = new String[] {‘test@gmail.com’};     mail.setToAddresses(toAddresses);     mail.setCcAddresses(ccAddresses);     mail.setReplyTo(toaddress);     mail.setSenderDisplayName(‘Name’);     mail.setSubject(‘Testing email through apex’);     mail.setBccSender(false);     mail.setUseSignature(true);     mail.setPlainTextBody(‘This is test email body. This mail is being sent from apex code’);     //mail.setHtmlBody(‘<b> This is HTML body </b>’ );     List<Messaging.Emailfileattachment> fileAttachments = new List<Messaging.Emailfileattachment>();     for (Attachment a : [select Name, Body, BodyLength from Attachment where ParentId = :caseId]){     Messaging.Emailfileattachment efa = new Messaging.Emailfileattachment();     efa.setFileName(a.Name);     efa.setBody(a.Body);     fileAttachments.add(efa);     //mail.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});     }     mail.setFileAttachments(fileAttachments);     Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });     } catch(Exception e) {}     }     PageReference reference = new PageReference(‘http://new-developer-edition.ap1.force.com/ThankYou?caseId=’+caseId);     reference.setRedirect(true);     return reference;     }     }