How to add data from one listbox to another listbox?

Question

The following data are displayed in listbox1. I want to pass items from listbox2 to listbox1. The result should be look as shown below (lb1).How can this be achieved? Many thanks for your help!

var itm = listBox2.Items[0].ToString();
          listBox1.Items.Add(itm);

enter image description here

Answer 1

Use AddRange Method. Try like:

listBox1.Items.AddRange(listBox2.Items);

Answer 2

You can use AddRange

listBox1.Items.AddRange(listBox2.Items);

Or if you want an exact copy of what is in the other listbox without your old items.

listBox1.Items = listBox2.Items;