doh-csharp-4.bcl.md

@@ -13,6 +13,7 @@
     * [3-3. System.IO.StreamWriter/Reader](#streamwriterreader)  
     * [3-4. System.IO.BinaryWriter/Reader](#binarywriterreader)  
     * [3-5. System.Runtime.Serialization.Formatters.Binary.BinaryFomatter](#binaryformatter)  
+    * [3-6. System.Xml.Serialization.XmlSerializer](#xmlserializer)  
 
 
 -- -- --
@@ -472,3 +473,5 @@ class BinaryFormatterEx
 }
 ```  
 
+### XmlSerializer  
+