c# - SelectNodes with Filter -

here xml:

<instrument recordcount="3" >     <department id = 18384, sequence=1>     <instrumentdata statuscode="1" roletype="ed" style="x" dataother='data'> </department> <department id = 18465, sequence=2>      <instrumentdata statuscode="2" roletype="cd" style="s" dataother='data'> </department> <department id = 16473, sequence=3>     <instrumentdata statuscode="1" roletype="cd" style="t" dataother='data'> </department>  </instrument> 

i want @status attribute ='1' or '2' , not @roletype='e' , 'f' , @style ='s' , 't' each node.

i have following statement, not bring correct results.

xmlnodelist nodelist = root.selectnodes(@"//department[instrumentdata/@status='1' or department[instrumentdata/@status='1' , not (department[instrumentdata/@roletype='e' or department[instrumentdata/@roletype='f') , (department[instrumentdata/@style='s' or department[instrumentdata/@style='t') ]", manager);

or first need first condition, build xml doc, next condition.

thanks.

there no problem have complex conditions in xpaht expressions. example can not work because of mistakes.
* brackets (]) missing
* there no status attribute in example xml.
* cant use "or" put note list.

example: if try departments instrumentdata/@statuscode = 2 , departments instrumentdata/@style= t.

the following not work:

nodelist = root.selectnodes("//department[instrumentdata/@statuscode='2'] or //department[instrumentdata/@style='t' ]"); 

but can either:

nodelist = root.selectnodes("//department[instrumentdata/@statuscode='2'] | //department[instrumentdata/@style='t' ]"); 

or (in view better):

nodelist = root.selectnodes("//department[instrumentdata/@statuscode='2' or instrumentdata/@style='t' ]");