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Send attachment Via Apex using Templates

Email Via Apex using Email Templates :

Contact con = [Select id from contact Limit 1];

List<String> emailsAll = new List<String>();

List<String> emailsCC = new List<String>();

String TemplateId = [SELECT Id FROM EmailTemplate WHERE DeveloperName = 'Multi_Language_Template_Test' LIMIT 1].Id;

List<Messaging.SingleEmailMessage> mails =  new List<Messaging.SingleEmailMessage>();   
        // Step 1: Create a new Email
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        // Step 2: Set list of people who should get the email

        // Step 3: Set who the email is sent from
        mail.setReplyTo(''); // change it with your/Company mail address.
        mail.setSenderDisplayName('Salesforce User');

       //Step 4 : when Using Template Id 
       mail1.setTargetObjectId(con.Id); //Mandatory while using Template(ID of  contact, lead, or user)
        // Step 4. Set email contents - you can use variables! when not using Template

        // Step 5. Attach file!  (Not Mendatory)
        List<Messaging.Emailfileattachment> fileAttachments = new   List<Messaging.Emailfileattachment>();
        for (Attachment a : [select Name, Body, BodyLength from Attachment where ParentId =: parentId ORDER BY CreatedDate DESC Limit : 1])
            Messaging.Emailfileattachment efa = new Messaging.Emailfileattachment();

        // Step 6. Add your email to the master list

        // Step 7: Send all emails in the master list


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