c# 4.0 - Why isn't Doxygen documenting public class functions for my C# code? -

i want use doxygen document c# code. so, i'm doing trial run. far not documenting public functions in test class. here code:

/**  * @file doxytest.cs  * @author jon plotner <plotnus@gmail.com>  * @version 1.0  *   * @section description  * test class testing , running doxygen  */  public class doxytest{  /**  * method1 adds 2 numbers  * @param vara first number added  * @param varb second number added  * @returns int sum of vara , varb  */  public int method1(int vara, int varb){     return a+b;  } /**  * method 2 compares value of 2 numbers  * @param vara first number  * @param varb second number  * @return bool, true if vara < varb  */  public bool lessthan(int vara, int varb){   } } 

in html output doxygen "doxytest class reference" empty save these lines:

the documentation class generated following file: *source/file1/doxytest.cs 

what doing wrong , how can fix this? appreciated i've been trying fix myself hours.