void AddTransactionStringToListViewTransaction(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Enter) { if (AddTransaction_TextBox.Text != string.Empty) { Transaction_String_ListBox.Items.Add(AddTransaction_TextBox.Text); Transaction_ItemSet_ListBox.Items.Add(apr.AddTransaction(AddTransaction_TextBox.Text)); UpdateDistinctItemBox(); AddTransaction_TextBox.ResetText(); } e.Handled = true; e.SuppressKeyPress = true; } }