Send email. Set body from HTML file

I am sending out an email very simply using the below code from within a WinApp not ASP

      System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
      message.IsBodyHtml = true;
      message.To.Add("");                  
      message.Subject = "";      
      message.From = new System.Net.Mail.MailAddress("");
      message.Body = "";      
      System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("");
      smtp.Send(message);

I am working on something that is needed to send out emails based on templates.   So I was curious if there was a way to build the BODY of the email from an external .html file.   It would make for this to be so much nicer versus having to put a thousand lines of HTML code within the message.Body STRING.    

I have another question which is, can I setup on the HTML page I create "if the above is even possible" to accept arguments/params to send the email off as well?   An example would be that I have a block such as [USERNAME] supplied on the html page.   I would pass the current username to the HTML page, and that is what would be sent to the user.    I've seen doing this with Resource files, but I really would like to stay away from that approach otherwise I will have to accomadate some else that is off topic.
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chrisryhalAsked:
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Meir RivkinConnect With a Mentor Full stack Software EngineerCommented:
what i'd do is having HTML template with place holders inside, which going be replaced with actual text before sending the email.for example, check this html: #HEAD TEXT# #BODY TEXT# now, before sending the email, you find load the html file to a string variable, find replace the "#BODY TEXT#" with the body text you wish to insert to the html and assign it to message.Body.you can go further and have css files and expand the html template but i don't think it's necessary in your case (if only body and maybe title are needed to be changed upon each email)
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chrisryhalAuthor Commented:
Sounds like a heck of a plan Sedgwick, will load it up and let you know.  
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chrisryhalAuthor Commented:
Ok, I have it working for the most part, but I'm thinking the best way to accomadate multiple values would be a loop.   I'm kinda having a brainfart here though.
Ok, so for starters it works for the most part and I was able to use a StreamReader to fetch my HTML using System.IO

      StreamReader streamReader = new StreamReader(@"\\<myserver>\ActiveCustomerTemplate.htm");
      string strHTMLBody = streamReader.ReadToEnd();
      streamReader.Close();

But lets say that the HTML that is pulled is stored like so........

          string strHTMLBody = "##STR1## walked with ##STR3## to avoid being seen by ##STR2## and ##STR4## walked with ##STR5##";

and I have an array setup like so that will be the "REPLACE" variables

            string str1 = "Chris";
            string str2 = "Jack";
            string str3 = "Heather";
            string str4= "Mark";
            string str5 = "Carla";
           
            string[] strArray = { str1, str2, str3, str4, str5 };
            foreach (string str in strArray)
            {
                  MessageBox.Show(str);
            }

What would be the most efficient manner to replace the ##STR1## with the "string str1" since the strHTMLBody variable will have multiple replaces required?
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chrisryhalAuthor Commented:
So I guess in terms of not being too complex, I'm trying to replace multiple values like so

         strEmailBody = strHTMLBody.Replace("##STR1##", str1);

and "strEmaiBody" would of course be the "mail.Body" value
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Meir RivkinConnect With a Mentor Full stack Software EngineerCommented:
the most efficient way is to load the html file to stringbuilder and using index to run from start to finish looking for the place holders and while doing so, replacing the place holders with the actual text.
however, if you have only a few place holders than it would be easier to simply do the following:

   StreamReader streamReader = new StreamReader(@"\\<myserver>\ActiveCustomerTemplate.htm");
      StringBuilder strHTMLBody = new StringBuilder(streamReader.ReadToEnd());
      streamReader.Close();
string[] strArray = { str1, str2, str3, str4, str5 };
            for(int i=0;i<strArray.Length;i++))
            {
                  strHTMLBody.Replace(string.Format("##STR{0}##", i+1),strArray[i]);
            }

Mail.Body = strHTMLBody;

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chrisryhalAuthor Commented:
Thank you so much for all of your help.  
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