what is the syntax for delete an item in listbox?

Dear Friend,

I am giving you the solution to delete one or more than one item.

For multiple selection of Items, you need to set the .SelectionMode property:

listBox1.SelectionMode = SelectionMode.MultiExtended;

Next, I am assuming that you have added the Items to your ListBox programmatically rather than using a DataSource (you wouldn't be able to remove them from the Items collection directly if the ListBox is using a DataSource).

It is done n the reverse order just in order to complete the operation of deletion successfuly
.

All you need to do is use the .RemoveAt() method, in reverse order (it is important to do it backwards, otherwise they won't be removed properly):-

for (int i = listBox1.SelectedIndices.Count-1; i >= 0; i--)
{
 listBox1.Items.RemoveAt(listBox1.SelectedIndices[i]);
}

OR

for (int i = 0; i < listBox1.SelectedItems.Count; i++)
      {
        listBox1.Items.Remove(listBox1.SelectedItems[i].ToString());
        i--;
      }