How to delete multiple items selected by the ListBox control (C #)

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The following is a solution for me:
By default, The ListBox control can only be selected. To select multiple items, you must set the selectionmode attribute to selectionmode. multisimple.

How can I capture this information if I want to delete multiple items selected by ListBox or perform other operations?

Private VoidButton_deleteselected_click (ObjectSender,EventargsE)

{

ListBox.SelectedindexcollectionSic = listbox_demo.selectedindices; // obtain the subscript of the selected item

If(Sic. Count =0)

Return;

Else

{

// Put the selected item in the list

List<Int> List =New List<Int> ();

For(IntI =0; I <SiC. Count; I ++)

{

List. Add (SiC [I]);

}

List. Sort (); // sort the list (the default sorting result in the library generally refers to sorting from bottom to big)

While(List. Count! =0) // Delete the selected item from The ListBox control in the ascending order of the subscript

// If other sequence is used here, the validity of the lower mark may be damaged.

{

Listbox_demo.items.removeat (list [list. Count-1]);

List. removeat (list. Count-1);

}

}

}

The following is a simple method for beginners:
Protected void removeappsclick (Object sender, eventargs E)
{

For (INT m = 0; m <listbox2.items. Count; m ++)
{
If (listbox2.items [M]. Selected)
Listbox2.items. Remove (listbox2.items [m]);
}
}