Please help me out with this .

I am working with ASP.net C#, I m using crystal report 10 . In crystal report i have a hyperlink field which helps in navigating across pages . I have written a code using if ..then..else construct which says if a particular field value in crystal report is null then navigate to webform1 else navigate to webform 2 . But the problem is in the syntax it dont accept null .

if ({Table.Column} )= NULL
then
webform1.aspx
else
webform2.aspx

i have also tried using "" . But nothing seems to work .