How I can check debug mode in MVC cshtml page

How I can check debug mode in MVC cshtml page? this code not working in cshtml page.

@{
bool isRelease = false;
#if DEBUG
 isRelease = false;
#else
 isRelease = true;
#endif
}
@{
if(isRelease)
{ < p > result1 < /p > }
else
{ < p > result2 < /p >}
}