方法一：

for (int i = listView1.SelectedItems.Count - 1; i >= 0; i--)
{
    ListViewItem item = listView1.SelectedItems[i];
    listView1.Items.Remove(item);                
}

方法二：

int Index = 0;            
if (this.listView1.SelectedItems.Count > 0)//判斷listview有被選中項
{         
       Index = this.listView1.SelectedItems[0].Index;//取當前選中項的index,SelectedItems[0]這必須為0       
       listView1.Items[Index].Remove();     
}