c# - Change ListBox Item Background color programmatically -

i having real hard time understanding how xaml works in connection c#. problem is, have 2 different list<string> objects filled content, want 1 list<string> have backgroundcolor 'blue' , other 1 have background color 'red'. afterwards want display in listbox

my xaml listbox code:

<listbox x:name="listbox1" horizontalalignment="left" height="240" margin="81,80,0,0" verticalalignment="top" width="321" borderbrush="#ff6c6c6c" selectionmode="single" selectionchanged="listboxselectionchanged">  </listbox> 

my c# code loads content listbox

public partial class mainwindow : window { public void additemstolistbox() {     foreach (var object1 in objects1)     {         thread.sleep(1);         listbox1.items.add(object1.label);         //i want these objects blue      }      foreach (var object2 in objects2)      {          thread.sleep(1);          listbox2.items.add(object2.label);          //i want these objects red      }  }  } 

here go:

foreach (var object1 in objects1) {     thread.sleep(1);     listbox1.items.add(new listboxitem { content = object1.label, background = brushes.blue });  }  foreach (var object2 in objects2)  {      thread.sleep(1);      listbox2.items.add(new listboxitem { content = objects2.label, background = brushes.red });      //i want these objects red  } 

a better way use data binding, styles, etc.