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I have a list boxes List1 and List2 and I want to add selected item from List2 to List1. I do as follows.

List1.Items.Add(List2.SelectedItem);

How to avoid duplicating in List1 if the same item from List2 is being added?

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1 Answer 1

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if (List2.SelectedItem != null 
  if (! List1.Items.Contains(List2.SelectedItem))
     {  List1.Items.Add(List2.SelectedItem);
        List2.Remove(List2.SelectedItem);
     }
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