Image With Runat=server Cannot See Code-behind Property

Jan 29, 2010

I've got the following in my .aspx:

<input type="image" src="<%=PayPalButtonImage %>" onserverclick="RedirectToPayPal" runat="server" />

In the code-behind I've got this property:

protected string PayPalButtonImage
{
get { return PayPalExpressCheckoutButtonUrl;}
}
protected void RedirectToPayPal()
{
}

why can't it see this property or the server method RedirectToPayPal? I get a runtime error of :

'ASP.cart_aspx' does not contain a definition for 'RedirectToPayPal' and no extension method 'RedirectToPayPal' accepting a first argument of type 'ASP.cart_aspx' could be found

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