No PostBack on Asp.Net button

I realize this is a common question, however I still can't seem to find a good answer.

I have the following ASP.Net C# code:

<asp:Button id="btnCalculate" runat="server" Text="Calculate" />

page load code...
btnCalculate.Attributes.Add("onclick", "JavaScript:calculateForm();");

How do I get the button not to post back?  I notice AutoPostBack=false is not an option.  I realize I can turn it into an HTML button, but I'm trying to avoid that for other reasons.
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as far as I know, you cannot prevent an asp button from doing a postback
TimCotteeHead of Software ServicesCommented:
Hi russomr,

btnCalculate.Attributes.Add("onclick", "JavaScript:calculateForm();return false;");

The return false will prevent the postback from happening.

Tim Cottee

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russomrAuthor Commented:
That's the ticket!  Thank you.
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