public static TransactionHistory CreateForm() // create public static method with form type return
{
if (instance == null)
{
instance = new TransactionHistory();
}
return(instance);
}
private void TransactionHistoryForm_FormClosing(object sender, FormClosingEventArgs e)
{
instance = null; // explicitly set form instance to null as form closes
}
private void buttonTransactionHistory_Click(object sender, EventArgs e)
{
history = TransactionHistory.CreateForm();
updateHistoryDisplay();
history.Show();
}