using System;
using System.Collections.Generic;
using System.Text;
using MujahidHtmlEmailHelper;

namespace EmailHelperByMujahid
{
    public class EmailTemplates : EmailTemplateFields
    {
    //Method for Welcome.html template
    public static IEmailTemplateFields Welcome(string customerName)
        {
            var fields = new Dictionary<string, string>();
            fields.Add("[CustomerName]", customerName); //[CustomerName] will be replaced with customerName in Welcome.html document.
            return EmailTemplate("Welcome.html", fields); //EmailTemplate method comming from EmailTemplateFields.
        }
    }
}

using System;
using MujahidHtmlEmailHelper;

namespace EmailHelperByMujahid
{
    class Program
    {
        static void Main(string[] args)
        {
            //Initialize email fields
            var emailFields = new EmailFields(
                subject: "your subject",
                to: "mujahidatwork@gmail.com",
                emailTemplateFields : EmailTemplates.Welcome("Muhammad Mujahid")
            );

            //Sending email using SendGrid
            var response = emailFields.SendEmail(new SendGridOptions()
            {
                ApiKey="YOUR SEND GRID API KEY",
                Email= "FROM EMAIL",
                Name= "FROM NAME"
            });

        }
    }
}