Input string was not in a correct format, “double.parse(textbox.text);”

Question

Hi am quite new to visual studios.

This is my code so far to make an example of an atm, i have a text box and i put an amount in and then i have this button where i clic

Answer 1

The problem is that the value in textboxamount.Text contains something that can't be converted to a double.

The best way to handle this is to use double.TryParse instead:

private void buttoncredit_Click(object sender, RoutedEventArgs e)
{
    double newAmount;
    if(!double.TryParse(textboxamount.Text, out newAmount))
    {
        // The input is wrong - handle that
        MessageBox.Show("Please enter a valid amount");
        textboxamount.Focus();
        return;
    }

    totalamount += newAmount;
    balance1 = "Your Balance is: £";
    label2.Content = balance1 + totalamount;
    // .. Your code...