asp.net 使用html模板发送电子邮件

在做一个基于ASP.NET的项目时需要使用html模板发送电子邮件，研究了下，总结如下：

        /// <summary>        ///替换模板中的字段值        /// </summary>        public string ReplaceText(String userName,string name,string myName)        {            string path = string.Empty;                     path = HttpContext.Current.Server.MapPath("Email_Template\\email.html");                               if (path == string.Empty)            {                return string.Empty;            }            System.IO.StreamReader sr = new System.IO.StreamReader(path);            string str = string.Empty;            str = sr.ReadToEnd();            str = str.Replace("$USER_NAME$", userName);            str = str.Replace("$NAME$", name);            str = str.Replace("$MY_NAME$",myName);            return str;        }