Question

<% if(Convert.ToInt32(Eval('NbrOrders'))>=Config.MAX_ENQUIRY_SALES) {  %> ...    <% } else { %> ...                                          <% } %> 

Gives me a InvalidOperationException? How do I write conditional html generation in ASP?

Answer 1

Use an inline statement as John_ states, or, create a function in your code behind that performs the logic required.

protected string MyFunction(int nbrOrders) {     if(nbrOrders>=Config.MAX_ENQUIRY_SALES)     {         return 'TrueResult';     }     else     {         return 'FalseResult';     } } 

Then use this as follows

<%# MyFunction(Convert.ToInt32(Eval('NbrOrders'))) %> 

EDIT: I’ve just read a comment on another post that states you want to show different HTML depending on this result. In that case, you can try using the Visible flag of a placeholder containing your code. Such as:

<asp:PlaceHolder id='PlaceHolder1' runat='server' visible='<%# (Convert.ToInt32(Eval('NbrOrders'))>=Config.MAX_ENQUIRY_SALES)%>'>     <div>My True Html Here</div> </asp:PlaceHolder> <asp:PlaceHolder id='PlaceHolder2' runat='server' visible='<%# !(Convert.ToInt32(Eval('NbrOrders'))>=Config.MAX_ENQUIRY_SALES)%>'>     <div>My FalseHtml Here</div> </asp:PlaceHolder>