Parallel.Invoke C# with Example

Invoking methods or actions in parallel (Parallel region) 
static void Main() 
{ 
string [] urls = 
{ 
"www.stackoverflow.com", 
"www.google.net", 
"www.facebook.com", 
"www.twitter.com" 
}; 
System.Threading.Tasks.Parallel.Invoke( 
() => PingUrl(urls[0]), 
() => PingUrl(urls[1]), 
() => PingUrl(urls[2]), 
() => PingUrl(urls[3]) 
); 
} 
void PingUrl(string url) 
{ 
var ping = new System.Net.NetworkInformation.Ping(); 
var result = ping.Send(url); 
if (result.Status == System.Net.NetworkInformation.IPStatus.Success) 
{ 
Console.WriteLine(string.Format("{0} is online", url)); 
} 
}