Code:
class CommandLine
{
    static void Main(string[] args)
    {
        // The Length property provides the number of array elements
        System.Console.WriteLine("parameter count = {0}", args.Length);

        for (int i = 0; i < args.Length; i++)
        {
            System.Console.WriteLine("Arg[{0}] = [{1}]", i, args[i]);
        }
    }
}

output:
parameter count = 3
Arg[0] = [a]
Arg[1] = [b]
Arg[2] = [c]


Note:
Input on Command-line		Array of strings passed to Main
executable.exe a b c		"a", "b", "c"
executable.exe one two		"one", "two"
executable.exe "one two" three	"one two", "three"