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I want to call on a method to execute whenever the space key is pressed whether my application is on focus or running in the background. How do I this in C# ? Let s say the method to call on is sendData(). How do I hook my keyboard on a level level to execute the sendData() method whenever the space key is pressed using C#.

You need to listen for a key press, in your case you're looking for ConsoleKey.Spacebar, the documentation for it here: ConsoleKey Enum
Here is a quick and dirty sample:
Console.WriteLine("Press Spacebar to send data");
while (!(Console.KeyAvailable && Console.ReadKey(true).Key == ConsoleKey.Spacebar))
{
// iterate something (or nothing)
}
sendData(); // call your method afterwards
It's important to note that Console.ReadKey is blocking. My code sample is just to illustrate some basics.