doh-csharp-4.bcl.md

@@ -17,7 +17,7 @@
     * [3-7. System.Runtime.Serialization.Json.DataContractJsonSerializer](#datacontractjsonserializer)  
 * [4. 컬렉션](#컬렉션)  
     * [4-1. System.Collections.ArrayList](#arraylist)  
-
+    * [4-2. System.Collections.Hashtable](#hashtable)  
 
 -- -- --
 
@@ -764,4 +764,5 @@ class CollectionIComparableEx
 }
 ```  
 
+### Hashtable