private void DeleteBtn_Click(object sender, EventArgs e)
 {
     ApplicationManager.deleteItem(comboBox1.SelectedItem.ToString());
     comboBox1.Items.Remove(comboBox1.SelectedItem);
     ApplicationManager.showStock(ApplicationManager.getDataGridViewFromInventoryStoreForm());
     ApplicationManager.getItemIDs(comboBox1);
 }
 private void DeleteItem_Load(object sender, EventArgs e)
 {
     ApplicationManager.getItemIDs(comboBox1);
 }