On my VS2005 project I have a asp:label with visible="false" and a asp:hyperlink with visible="true". In the C# code I conditionally control it and another control's visibility. This code (simplifed example code fragment) doesn't work

if ( cond )
   {
   lblX.Visible = true;
   }
hypY.Visible = ! lblX.Visible;

When the page runs sure enough lblX is visible, but hypY stays visible. If I step through the code even after the execution of the lblX.Visible = true; the debugger shows the property value to still be false. I have to resort to this sort of hack code

bool bHack = false;
if ( cond )
   {
   lblX.Visible = true;
   bHack = true;
   }
hypY.Visible = ! bHack;

Why do I have to use an alternate variable? Why can't I get the accurate visibilty of lblX in order to control hypY's visibility?