// Declare variable of type String.
String strGreeting;

// Declare variable of type DateTime.
DateTime now = DateTime.Now;

void Page_Load ( Object Src, EventArgs E ) {
   // Check for am/pm and output appropriate message. 
   if ( now.Hour >= 12 ) {
      if ( now.Hour >= 18 )
         strGreeting = "Good Evening.";
      else
         strGreeting = "Good Afternoon.";
   }
   else {
      strGreeting = "Good Morning.";
   }
}