WPF filtering ListBox after ComboBox selected changes c# -


i have combobox binded 1 datatable(1 column "country") , listbox binded 1(2 columns "name", "country"). how make listbox filter on selected item in combo box changes?

for example:

combobox values: ger, pol, rus

datatable binded listbox:

name | country  john | ger luke | pol sasha| rus cj   | ger carl | pol

when choose ger in combobox want refresh listbox see only:
john
cj

i used filter datatable

   dataset.tables["name"].defaultview.rowfilter = "country '%" + comboboxfilter.text + "%' ";

but have result delayed 1 click.

 change | result   ger       | no change  pol       | see ger names  rus       | see pol names  pol       | see rus names

why delayed?

combobox.text   delayed 1 event

to actuall selected value in selection change event code needed 

datarowview drw = (datarowview)(sender combobox).selecteditem; string text = drw["type"].tostring() ;

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