How to calculate download Speed using C#.net and Java Script code

Using C#.Net code

private void CalculateDownloadTime(double fileSizeMB,double fileSizeKB,int speed,ref int timeHour,ref int timeMinute,ref int timeSec)
{
double downloadTime = 0;

if (fileSizeMB != 0)
{
downloadTime = (fileSizeMB * Constant.FILE_SIZE_KB * 8.192) / speed;
}
else if (fileSizeKB != 0)
{
downloadTime = (fileSizeMB * 8.192) / speed;
}

timeHour = Convert.ToInt32(downloadTime) / 3600;
timeMinute = (Convert.ToInt32(downloadTime) % 3600) / 60;
timeSec = Convert.ToInt32(downloadTime) % 60;
}

Example to call above function:

int timeHour =0;
int timeMinute =0;
int timeMinute =0;
CalculateDownloadTime(30,0,56, ref timeHour, ref timeMinute, ref timeMinute);

Using Java Script

<script type="text/javascript">
var speeds = new Array(
 new Array("9.6 Modem", "9.6"),
 new Array("14.4 Modem", "14.4"),
 new Array("19.2 Modem", "19.2"),
 new Array("28.8 Modem", "28.8"),
 new Array("33.6 Modem", "33.6"),
 new Array("56 Kb Modem", "56"),
 new Array("Single Channel ISDN (64Kbps)", "64"),
 new Array("Dual Channel ISDN (128Kbps)", "128"),
 new Array("Asymmetric DSL (ADSL)", "384"),
 new Array("Single-pair HDSL (S-HDSL)", "768"),
 new Array("Consumer DSL (CDSL)", "1024"),
 new Array("T1", "1544"),
 new Array("HDSL", "1544"),
 new Array("T3", "46080"),
 new Array("Very high-speed DSL (VDSL)", "52224"),
 new Array("OC1", "53248"),
 new Array("100 Base-T (fast ethernet)", "102400"),
 new Array("ATM", "158720"),
 new Array("OC3", "159744"),
 new Array("1000 Base-T", "1024000")
);

function compute (form, scale)
{
 if (form.size == null form.size.length == 0)
 {
  alert("Please enter a valid filesize.");
  return;
 }

 var size = parseFloat(form.size.value);
 for (var i = 1; i <= speeds.length; i++)
 {
  var time = size * scale * 8.192 / speeds[i - 1][1];
  var hours = Math.floor(time / 3600);
  var minutes = Math.floor((time % 3600) / 60);
  var seconds = Math.floor(time % 60);
  form[i + "hour"].value = hours;
  form[i + "minute"].value = minutes;
  form[i + "second"].value = seconds;
 }
 
}
</script>  

Example to call above (compute) function:

For file Size MB --> compute(30,1024)
For file size KB --> compute(30,1)

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Domain Validation

After sending a mail we need to validate for domain as well as account whether "To" or "From" mail id and domain are valid or not, it can be validate from .NET code using System.Net.Sockets.

Note: Use of sockets requires a trust level above the default "Medium".

Namespace
using System.Net;
using System.Net.Sockets;

C# Code

string email = "recipient@domain.com";

string[] host = email.Split('@');

string hostName = host[1];

Socket socket;

try

{

IPHostEntry entry = Dns.GetHostEntry(hostName);

IPEndPoint endPoint = new IPEndPoint(entry.AddressList[0], 25);

socket = new Socket(endPoint.AddressFamily, SocketType.Stream,

ProtocolType.Tcp);

socket.Connect(endPoint);

}

catch (SocketException ex)

{

// Invalid email.

}

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