When bulding professional web applications, there can be so many emails to be sent to users and writing the templates for each of this email inside code is not a good move. Here we can use email templates. First create a folder some where in your application directory as "MailTemplates" or some other suitable name. Now create a text file or html file for template.

In this example, we are creating a sample template named welcome.htm:

Hi, <%=name%>

This is a sample mail template for demonstrating usage of email templates in asp.net

<a href="<%=url%>">Click here to read the article</a>
<a href="<%=rooturl%>">http://example.com/</a>

Now, we are creating an email utility for preparing and sending emails:

public static void SendMail(string fromAddress, string toAddress, string subject, string body)
       {
           using (MailMessage mail = BuildMessageWith(fromAddress, toAddress.Replace(',', ';'), subject, body))
           {
               SendMail(mail);
           }
       }
       public static void SendMail(MailMessage mail)
       {
           try
           {
               SmtpClient smtp = new SmtpClient("your smtp host",port);
               smtp.Send(mail);
           }
           catch (Exception e)
           {
            
           }
       }
       //build a mail message
       private static MailMessage BuildMessageWith(string fromAddress, string toAddress, string subject, string body)
       {
           MailMessage message = new MailMessage
           {
               Sender = new MailAddress(Settings.WebMasterEmail), // on Behave of When From differs
               From = new MailAddress(fromAddress),
               Subject = subject,
               Body = body,
               IsBodyHtml = true,
           };

           string[] tos = toAddress.Split(';');

           foreach (string to in tos)
           {

               message.To.Add(new MailAddress(to));
           }

           return message;
       }
    // read the text in template file and return it as a string
       private static string ReadFileFrom(string templateName)
       {
           string filePath = System.Web.HttpContext.Current.Server.MapPath("~/MailTemplates/"+templateName);

           string body = File.ReadAllText(filePath);

           return body;
       }
       // get the template body, cache it and return the text
       private static string GetMailBodyOfTemplate(string templateName)
       {
           string cacheKey = string.Concat("mailTemplate:", templateName);
           string body;
           body = (string)System.Web.HttpContext.Current.Cache[cacheKey];
           if (string.IsNullOrEmpty(body))
           {
               //read template file text
               body = ReadFileFrom(templateName);

               if (!string.IsNullOrEmpty(body))
               {
                   System.Web.HttpContext.Current.Cache.Insert(cacheKey,body, null,DateTime.Now.AddHours(1),System.Web.Caching.Cache.NoSlidingExpiration);
               }
           }

           return body;
       }
       // replace the tokens in template body with corresponding values
       private static string PrepareMailBodyWith(string templateName, params string[] pairs)
       {
           string body = GetMailBodyOfTemplate(templateName);

           for (var i = 0; i < pairs.Length; i += 2)
           {
               body = body.Replace("<%={0}%>".FormatWith(pairs[i]), pairs[i + 1]);
           }
           return body;
       }
 public static string FormatWith(this string target, params object[] args)
        {
            return string.Format(Constants.CurrentCulture, target, args);
        }

Now let's send the email:

string subject = "Welcome";
string body = PrepareMailBodyWith("welcome.htm", "name", "Anoop", "url", "http://waytocoding.blogspot.com/","rooturl","http://waytocoding.blogspot.com/");
SendMail("[email protected]", "[email protected]", subject, body);

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