c# - How to exclude already existing items from dropdownlist? The values are populated based on some condition in xml -

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in web application project have linkbutton , when clicking popup page addcontrolspopup.aspx come .

on page have fill ddlvalues dropdownlist xml condition.

the first dropdownlist ddlvalues. dropdownlist populated data.

the second dropdownlist ddlcontroltype

third dropdownlist ddlconditioncontrol.

in popup page there exists button add controls , need select values these 3 dropdownlist.

after clicking button, 3 dropdownlist values added xml controls section.

in page there exist button add controls. saved xml.

this process.

my doubt after adding combination of controlvalue, controltype , conditioncontrol, have exclude controlvalue first dropdownlist ddlvalues

pls

i have xml file following data.

< controlset>  < control>  < values>  < valueid>1< /valueid>  < valuename> abc < /valuename>  < /values>  < values>  < valueid>2< /valueid>  < valuename> def< /valuename>  < /values>  < values>  < valueid>3< /valueid>  < valuename> xyz< /valuename>  < /values>  < controls>  < controlvalues>  < valueid>1 </valueid>  < controltypeid>1 < /controltypeid>  < conditoncontrolid> 1 < /conditioncontrolid>  < /controlvalues>  < controlvalues>  < valueid>1 </valueid>  < controltypeid>1 < /controltypeid>  < conditoncontrolid> 2 < /conditioncontrolid>  < /controlvalues>  < controlvalues>  < valueid>1 </valueid>  < controltypeid>2 < /controltypeid>  < conditoncontrolid> 1 < /conditioncontrolid>  < /controlvalues>


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