.net设置重点文字颜色为红色

各位:
   我写了一个发邮件的函数,但是想在重点的文字用红颜色显示,请问如何设置?vb.net
代码如下:
  Public Function dsemail2(ByVal mail As String, ByVal file_no As String, ByVal file_name As String, ByVal file_session As String, ByVal file_path As String) As Integer
        Dim subjectstr, demostr As String
        subjectstr = file_name + "文件新发布"//红色显示
        demostr = "您好！" & Environment.NewLine
        demostr = demostr & "新文件发布通知，请勿回复！" & Environment.NewLine
        demostr = demostr & "<script language =javascript><font color = red>今天新上传了文件,请您查阅！</font></script>" & Environment.NewLine
        demostr = demostr & Environment.NewLine & "文件编号:" + file_no
        demostr = demostr & Environment.NewLine & "文件名称 :" + file_name
        demostr = demostr & Environment.NewLine & "文件版本号:" + file_session
        demostr = demostr & Environment.NewLine & "文件路径:" + file_path
        demostr = demostr & Environment.NewLine & "以上" & Environment.NewLine
        demostr = demostr & "　　希望您能抽时间查看！"
        '---------------------------------------------------------将员工编号和姓名分开
        Dim message As MailMessage = New MailMessage(stremail.ToString, mail, subjectstr, demostr) 'toemail
        Dim client As SmtpClient = New SmtpClient(strsmtp.ToString)
        client.UseDefaultCredentials = False
        client.Credentials = New System.Net.NetworkCredential(stremailuser.ToString, stremailpassword.ToString)
        client.DeliveryMethod = SmtpDeliveryMethod.Network
        client.Send(message)
        Return 1

    End Function --------------------编程问答-------------------- subjectstr = file_name + "<font color=red>文件新发布</font>"//红色显示    --------------------编程问答-------------------- 不是这样的,你的方法不对!有高手指点么? --------------------编程问答-------------------- subjectstr它的载体是什么？



它的载体.ForeColor = Color.Red

这样可以不？？ --------------------编程问答-------------------- 如果你用的TEXTBOX的话,肯定不行.它是一红俱红地.
你用RichTextBox可以的. --------------------编程问答-------------------- 1 打开系统自带的"写字板"
2 输入"文件新发布"并设置为红色
3 保存RTF
4 用"记事本"打开该RTF,复制所有内容
5 subjectstr = file_name + 复制的内容

补充：.NET技术 ,  VB.NET