Network Traffic Monitor

[Nathan91]

Hey guys, a programming noob here so go easy on me please! LOL

I could really do with some help. I have been asked to create a Windows Forms Application using C# that can monitor network traffic (bytes received and sent) within a specified time interval. I really have tried but I've reached a dead end and really don't know where to go next.

If anyone could look over this code and tell me the errors of my ways and how to get the **** thing working I'd be most grateful!

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.NetworkInformation;

namespace Network_Traffic
{
public partial class Form1 : Form
{

public Form1()
{
InitializeComponent();
}

NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();

int iInterfaceNum;
int iFrequency;
double dBytesReceived;
double dBytesSent;

private void btnStart_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
if (txtAdapter.Text == "")
{
MessageBox.Show("Type a network adapter number into the text box.", "No Input",
MessageBoxButtons.OK, MessageBoxIcon.Information);
txtAdapter.Focus();
txtAdapter.SelectAll();
}

if (txtFrequency.Text == "")
{
MessageBox.Show("Type a frequency value into the text box.", "No Input",
MessageBoxButtons.OK, MessageBoxIcon.Information);
txtFrequency.Focus();
txtFrequency.SelectAll();
}

}

private void timer1_Tick(object sender, EventArgs e)
{
iInterfaceNum = Convert.ToInt32(txtAdapter.Text);
iFrequency = Convert.ToInt32(txtFrequency.Text);

if (rdoReceived.Checked == true)
{
dBytesReceived = interfaces[iInterfaceNum].GetIPv4Statistics().BytesReceived;
dBytesReceived.ToString(lstData.Text);
}

else
{
dBytesSent = interfaces[iInterfaceNum].GetIPv4Statistics().BytesSent;
dBytesSent.ToString(lstData.Text);
}
}

private void btnStop_Click(object sender, EventArgs e)
{
timer1.Enabled = false;
}

}
}

I've also attached the project!

Again, I'm new to programming so please bear that in mind, but please do help me!