Problem with if statement

Below is the code that displays any field(s) that have values within the fieldset, but doesn't display any field(s) that don't have values.

<FIELDSET><legend>Client Dinner/Entertainment</legend>
<%if nullresult(rec("dwhat"))<>"" then%>
What: <font color="#777777"><%=nullresult(rec("dwhat"))%></font><%end if%><br><br>
<%if nullresult(rec("daudience"))<>"" then%>
Audience: <font color="#777777"><%=nullresult(rec("daudience"))%></font><%end if%><br><br>
<%if nullresult(rec("dwhen"))<>"" then%>
Where: <font color="#777777"><%=nullresult(rec("dwhen"))%></font><%end if%><br><br>
<%if nullresult(rec("dcontact"))<>"" then%>
Contact: <font color="#777777">
<%if instr(nullresult(rec("dcontact")), "@")>0 then%>
<a href="mailto:<%=nullresult(rec("dcontact"))%>"><%=nullresult(rec("dcontact"))%></a>
<%else%>
<%=nullresult(rec("dcontact"))%>
<%end if%>
</font><%end if%>

</FIELDSET>

I want to add a code before the <fieldset> that it doesn't display anything within the fieldset if all four fields within the fieldset don't have values. The <%end if%> statement appears after </fieldset>. The code displays the fieldset if anyone of the fields have values.

<%if nullresult(rec("dwhat"))<>"" | nullresult(rec("daudience"))<>"" | nullresult(rec("dwhen"))<>"" | nullresult(rec("dcontact"))<>"" then%>

This code generates an error message "Character is not valid". What's wrong with the if statement at the top? Any other ways to make it work?

 

actually, you are testing for an empty string value

nullresult(rec("dwhat"))<>""

Code (markup):

you should check for nulls, or change nulls to empty strings.

e.g

<%if IsNull(nullresult(rec("dwhat"))) | IsNull(nullresult(rec("daudience"))) | IsNull(nullresult(rec("dwhen"))) | IsNull(nullresult(rec("dcontact"))) then%> 

Code (markup):