How to check if a field is null?

[Shapper]

Hello,

I need to check if a datareader field is empty.

My Datareader field is given by:
drProduct.Item("image02_url")

How can I do this?

Using drProduct.Item("image02_url") = "" is not working.

Thanks,
Miguel

 

[Marina]

IsDbNull(drProductItem("image02.url"))

or

drProduct.Item("image02_url") Is DbNull.Value