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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