.NET (Core and Framework)

StringBuilder sb = new StringBuilder();
     byte[] buf = new byte[131072];
     string url = null;
     url = "http://google.com";
     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
     if (request.HaveResponse)
     {
         Stream resStream = response.GetResponseStream();
         string tempString = null;
         int count = 0;
         do
         {
             count = resStream.Read(buf, 0, buf.Length);
             if (count != 0)
             {
                 tempString = Encoding.ASCII.GetString(buf, 0, count);
                 sb.Append(tempString);
             }
         } while (count > 0);
     }
     richTextBox1.Text = sb.ToString();