StreamWriter corrupting my RTF?

Basically, I want the user to fill out a form and have the RTF file updated with those values and then emailed as an attachment.

My code is as follows:

Code:

---

System.IO.StreamReader reader = new System.IO.StreamReader(Server.MapPath("~/GrantProposal/text2.rtf"));
            string file = reader.ReadToEnd();
            reader.Close();

            file = file.Replace("gp1", frmDirector.Text);
            file = file.Replace("gp2", frmPhone.Text);

            System.IO.StreamWriter sw = new System.IO.StreamWriter(Server.MapPath("~/GrantProposal/text2.rtf"));
            sw.Write(file);
            sw.Flush();
            sw.Close();

            MailMessage mail = new MailMessage();
            mail.To.Add(emailTo);
            mail.From = new MailAddress(emailTo);
            mail.Subject = "Grant Proposal";
            //mail.Body = info;
            Attachment attach = new Attachment(Server.MapPath("~/GrantProposal/text2.rtf"));
            mail.Attachments.Add(attach);
            SmtpClient smtpClient = new SmtpClient("localhost");
            smtpClient.Send(mail);

---

When I test this, it emails the RTF fine, but when I download the attachment and try to open in Word, it gives me an error saying that the file is corrupted and data is either missing or invalid.
Any ideas?
I am using 3.5 if that helps..

Thanks

First try to exclude these lines

Code:

---

file = file.Replace("gp1", frmDirector.Text);
 file = file.Replace("gp2", frmPhone.Text);

---

You are changing the raw rtf directly and I'm not sure if there isn't a checksum in the rtf.

Removing those lines didn't work. Even if I were to, how else would I be able to update the RTF with the user-inputted values?

It's something when I use sw.Write(file);
The file isn't corrupted if I comment that line out, but it also doesn't update.

Any other ideas?

hah, just kidding..

I think the problem is when I'm reading the file to a string
string file = reader.ReadToEnd();
I get a bunch of characters in the string like "�" and there isn't even the "gp1" and "gp2" that I want to replace.
So I guess my question now is, how should I go about reading the RTF file to a string? I tried Encoding, but that didn't do anything..

What about try to utilize RichTextBox class and it's LoadFile and SaveFile methods together with the Rtf property?

Something like:

Code:

---

RichTextBox rtb = new RichTextBox();
rtb.LoadFile(Server.MapPath("~/GrantProposal/text2.rtf"));
rt.Rtf = rt.Rtf.Replace("gp1", frmDirector.Text);
rt.Rtf = rt.Rtf.Replace("gp2", frmPhone.Text);
rtb.SaveFile(Server.MapPath("~/GrantProposal/text2.rtf"));

// ... you code follows

---