Move items from one ListBox to another ListBox in asp net web application

i know how to transfer or pass value from one Listbox to Another Listbox
but i Don't know how transfer it without selection

What I have tried:

listBox2.Items.Add[listBox1.SelectedItem];
listBox1.Items.Remove[listBox1.SelectedItem];
this i tired but i select the items but i want to without selecting, transfer them

The SelectedItem property just returns the currently selected item - but you are already using the property you need: ListBox.Items
All you have to do is decide which item[s] you want, and access them directly via the Items property:listBox2.Items.Add[listBox1.Items[indexOfItemIWant]]; listBox1.Items.Remove[listBox1.Items[indexOfItemIWant]];

It's basically the same, but you just define the index of the item you want to modify.

Consider the following example

[ADDED]

Example of moving several items

[ADDED]
Since you're using multiselect list as source, you can loop through the selected items. For example

Add your solution here

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