> var arr = new[] { 1.5,2.0 };
                                 arr = { 1.5, 2.0 }
 > var sum = arr.Sum();
                                 sum = 3.5

private static void Main(string[] args)
{
  // Call the PowerShell.Create() method to create an
  // empty pipeline.
  PowerShell ps = PowerShell.Create();

  // Call the PowerShell.AddScript(string) method to add
  // some PowerShell script to execute.
  ps.AddScript("$arr = 1.5,2.0"); # Execute each line read from prompt

  // Call the PowerShell.Invoke() method to run the
  // commands of the pipeline.
  foreach (PSObject result in ps.Invoke())
  {
    Console.WriteLine(result.ToString());
  }
}