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my app have 2 list box i want when i click on list box2 item number 10.
list box1 selected item = number 10,
sorry for bad English.
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1 solution

Use the following code if you want to select on ListBox2 the item having the same index of the selected one of ListBox1.

C#
private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
   int cursel = listBox1.SelectedIndex;
   if ( cursel < ListBox2.Items.Count )
   {
     ListBox2.SetSelected(cursel, true);
   }
}
 
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