private void Clear()
{
SaveButton.Enabled = true;
UpdateButton.Enabled = false;
BrandTextBox.Clear();
BrandTextBox.Focus();
}
private void AddPhoneButton_Click(object sender, EventArgs e)
{
// create a cellphone object
CellPhoneInventory myphone = new CellPhoneInventory();
// get the phone data
getdata(myphone);
//Add the cell phone object to the list
phoneList.Add(myphone);
// add the entry to the list box
PhoneListBox.Items.Add(myphone.Brand + " " + myphone.Model);
// clear the contents of the textbox
BrandTextBox.Clear();
ModelTextBox.Clear();
PriceTextBox.Clear();
BrandTextBox.Focus();
}