Download HTML Page Programmatically C#

using (WebClient client = new WebClient()) // WebClient class inherits IDisposable
               {
                   ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(delegate { return true; });
// If credentials is required use this below line
                   client.Credentials = new System.Net.NetworkCredential("UserId", "Password", "DomainName");

                   // you can get the file content without saving it:
                   strHtmlCode = client.DownloadString(htmlDisplyFormUrl);

                   FileStream fStream = new System.IO.FileStream(@"D:\HtmlFolder\Sample.Html", System.IO.FileMode.Create);
                   byte[] b = System.Text.Encoding.UTF8.GetBytes(strHtmlCode);
                   fStream.Write(b, 0, b.Length);
                   fStream.Close();
                   //...
               }