WPF Treeview fuzzy query Node

 <TextboxX: Name= "Tbseach"Height= "25"Width= "60"Horizontalalignment= "Center"Verticalalignment= "TOP" Textchanged= "Tbseach_textchanged"/>
 

   Private    Void  Tbseach_textchanged (  Object  Sender, textchangedeventargs E)
{
_ Seachfoolist  =     New  List  <  Fooviewmodel  >  ();
  Foreach  (Fooviewmodel Model  In Treegoods. Items)
{
  Foreach  (Fooviewmodel foo  In  Findnode (model, tbseach. Text. Trim ()))
{
Foo. ischecked  =     True  ;
};
}
} 

   //  Fuzzy searchAlgorithm  
   Private  List  <  Fooviewmodel  >  Findnode (fooviewmodel tnparent,  String  Strvalue)
{
  If  (Tnparent  =     Null  )  Return    Null  ;
  If  (Tnparent. Name. indexof (strvalue)  >     -  1     &&     !  String  . Isnullorempty (strvalue ))
{
_ Seachfoolist. Add (tnparent );
}
 Foreach  (Fooviewmodel foo  In  Tnparent. Children)
{
Foo. ischecked  =     False  ;
Findnode (Foo, strvalue );
}
  Return  _ Seachfoolist;
}