VS C# 2008 Object Reference Error

[Mike]

The snippet below is from a small console app I'm playin' around with in C#.
Upon building the app, I receive the error message "An object reference is
required for the non-static field, method, or property
bla.bla.ConvTempoToMilliseconds(int)".

int tempo = Convert.ToInt32(args[1]);

// ERROR on following line

display(ConvTempoToMilliseconds(tempo));
return;

}

public int ConvTempoToMilliseconds(int tempo)

{

// duration = 60000 / tempo

return 60000 / tempo;

}

Thanks for your thoughts,

Mike