[Atli]

Judging by the SoundPlayer Class documentation, there is only one form of the Play method: without any arguments. That would be why your code is failing, because it isn't expecting you to pass an argument.

There is however a SoundLocation property, so you could try using that:

DialToneJukeBox.SoundLocation = Resource1._1;
DialToneJukeBox.Play();

Not sure if it has to be loaded first, or if Play takes note of the updated location first and loads it for you.

[Martyr2]

Play() doesn't take an argument. You setup the SoundPlayer class with the sound you want to play and then call Play() to play it. In other words...

SoundPlayer DialToneJukeBox = new SoundPlayer();

private void button1_Click(object sender, EventArgs e)
{
     // Tell it the location of the sound file
     DialToneJukeBox.SoundLocation("path to sound file");

     // Load it into the player
     DialToneJukeBox.Load();

     // Play it
     DialToneJukeBox.Play();
}

This of course can probably be refactored so that it cuts down on all the lines of code here, but I wanted you to see that Play() itself doesn't take a parameter. It simply starts the sound file.