Hello,
You can use
one of the methods available for transformations, especially in this case, it's method
IfEmpty.
You can see a nice example in the Context help:
<%# IfEmpty(Eval("ProductPhoto"), "no image", GetImage("ProductPhoto")) %>
• Checks for emptiness of the value specified in the first parameter. If it is NULL, the second parameter is returned. If it has some value, the third parameter is returned.
Best regards,
Martin Danko