>>Speaking of Action I could have used an Action< T, T >
>>

>>		static Dictionary <string, Action<GroupMember, MKVP>> Actions = new Dictionary<string,Action<GroupMember,MKVP>>()
>>		{	 {"PRI_KEY", ChangePrimaryKey}
>>			,{"FIRST", ChangeFirstName}
>>			,{"LAST", ChangeLastName}
>>			,{"GSTNO", ChangeGuestNo}
>>			,{"NOTES", ChangeNotes}
>>		};
>>

>Even better :-}

It's a matter of taste

If you pull it out of the dictionary to assign it to a variable, I prefer declaring the delegate with a meaningful name
In that case you don't have to repeat the definition

Action<GroupMember, MKVP>>  action;

If you access the dictionary directly - then perhaps yes

dict[someString](groupmember, mkvp);