how to find network status

I want to write a program in C# that recognize now computer connected to inter开发者_开发技巧net or not by C#. Would you help me how to do that, I have no idea about it,because I didnt work network in C#.

one more question,how I can run a program from c# and sent argument also?

Here is a simple example on how you can check if your computer is connected to the internet.

Here is another example on how to launch a program in C#. You can check this msdn page for more information on the Process class.

You could use the GetHostEntry method to test DNS:

public static bool IsConnected()
{
    try
    {
        var entry = Dns.GetHostEntry("www.google.com");
        return true;
    }
    catch (SocketException ex)
    {
        return false;
    }
}

As far as the second part of your question is concerned about command line arguments you would pass them at the command prompt:

c:\>foo.exe param1 param2

and you could fetch them as a string array in your Main method:

class Program
{
    static void Main(string[] args)
    {
        // args will represent a string array of command line 
        // arguments passed to your application. It will be an
        // empty array if no arguments were passed
    }
}