Change tags to context help (and whitespace change)

EduNetworkBuilder/NB.cs

@@ -45,7 +45,7 @@ namespace EduNetworkBuilder
     public enum NetTestVerbosity { none, basic, hints, full }
     public enum LBContents { routes, messages, dhcp, puzzles }
     public enum HelpTopics { 
-        DHCP, DHCPServer, Firewall, Gateway, Help, IPAddress, Link, Subnet, Ping,
+        None, DHCP, DHCPServer, Firewall, Gateway, Help, IPAddress, Link, Subnet, Ping,
         VPN, Hub, Switch, ARP, StaticRoute, Subnetting, WhenToSubnet, ComparingAddresses, MACAddress,
         Network, Packet, NIC, Interface
     }
@@ -459,7 +459,16 @@ namespace EduNetworkBuilder
 
         public static T ParseEnum<T>(string value)
         {
-            return (T)Enum.Parse(typeof(T), value, true);
+                // Do not initialize this variable here.
+                return (T)Enum.Parse(typeof(T), value, true);                
+        }
+
+        public static T TryParseEnum<T>(string value, T Default )
+        {
+            if (!Enum.IsDefined(typeof(T), value))
+                return Default;
+
+            return (T)Enum.Parse(typeof(T), value);
         }
 
         public static GeneralComponentType GetComponentType(NetworkComponent What)
@@ -472,6 +481,13 @@ namespace EduNetworkBuilder
             return theType;
         }
 
+        public static void ReadContextHelp(HelpTopics What)
+        {
+            //make a new window if needed
+            //load help
+            //Jump to the correct location
+        }
+
         public static string GenerateMACAddress()
         {
             var sBuilder = new StringBuilder();