.net - how to convert parent object with child object list into xml file using c#? -

i have parent table class , child table subject. have created objects of these classes , child objects added list in parent class. want read parent table data using linq , convert xml file using xml serialization.

here's code

classmaster cls = new classmaster();list<classmaster> clslist =     cls.findall().where(t => t.classsymbol == "i").tolist();  var serializer1 = new xmlserializer(cls.findall().gettype()); classmaster cls = new classmaster(); var stringwriter = new system.io.stringwriter(); var serializer = new xmlserializer(cls.gettype()); serializer.serialize(stringwriter, cls); 

but throwing exception in line 3

"cannot serialize member 'school.objects.classmaster.classsubjectlist' of type 'system.collections.generic.ilist`1[[school.objects.classwisesubject, school.objects, version=1.0.0.0, culture=neutral, publickeytoken=null]]'"

public class classmaster : genericrepository<classmaster> {   public virtual int classid { get; set; }   public virtual string classsymbol { get; set; }   public virtual string classname { get; set; }   public virtual ilist<classwisesubject> classsubjectlist { get; set; } }  public class classwisesubject : genericrepository<classwisesubject> {   public virtual int id { get; set; }   public virtual int parentid { get; set; }   public virtual int serialno { get; set; }   public virtual string subjectcode { get; set; } } 

hbm config file :

  <class name="classmaster" table="tbl_classmaster">     <id name="classid" column="classid" type="int">       <generator class="identity"></generator>     </id>     <property name="classsymbol"  column="classsymbol" type="string"/>     <property name="classname"  column="classname" type="string"/>     <list name="classsubjectlist" cascade="all" lazy ="false">       <key column="parentid"/>       <index column="serialno"/>       <one-to-many class="classwisesubject"/>     </list>   </class>    <class name="subjectmaster" table="tbl_subjectmaster">     <id name="subjectid" column="subjectid" type="int">       <generator class="identity"></generator>     </id>     <property name="subjectcode"  column="subjectcode" type="string"/>     <property name="subjectname"  column="subjectname" type="string"/>   </class> 

thanks surajit

xmlserializer doesn't support ilist<t> interface. have several options:

• change type ilist<t> concrete class (e.g. list<t>);
• use datacontractserializer instead of xmlserializer;
• implement ixmlserializable;
• create fake property of type list<t> xmlserializer reading , writing classsubjectlist , mark classsubjectlist [xmlignore] attribute.