How do I make a basic timer

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when I click the play button it show = System.FormatException: 'Input string was not in a correct format.'

pls try your best to help me

timer1 is a timer from the toolbox

totaltime is a name of my timer,
and a timer is on a label

What I have tried:

namespace my_first_app_dad
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            timer1.Start();
        }

        private void Timer1_Tick(object sender, EventArgs e)
        {
            int number = Int32.Parse(totaltime.Text);
            number =+ 1;

        }
    }
}

Posted 10-Jul-19 12:00pm

Member 14525501

Updated 10-Jul-19 22:21pm

Rick York

v2

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[no name] 10-Jul-19 20:26pm

Maybe "totaltime.Text" ain't an int.

2 solutions

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CPallini · Answer 1 · 2019-07-10T22:21:00

Solution 2

This happens because totaltime.Text it is not a compliant string representation of an integer. You might either

Handle the excetpion (see the the code sample in the documentation[^]).

or

Use, as already suggested, the Int32.TryParse[^] method.

Posted 10-Jul-19 22:21pm

CPallini

Comments

Maciej Los 12-Jul-19 2:14am

:thumbsup:

CPallini 13-Jul-19 3:40am

Thank you, Maciej!

emerR46 · Answer 2 · 2019-07-10T18:32:00

Solution 1

You can try this.

C#

If(Int.tryparse(totaltime.text, out int number))
{
 int num = number + 1;
 totaltime.text = $"{num}";
}

Let me know if it works for you.

Posted 10-Jul-19 18:32pm

emerR46

Updated 11-Jul-19 20:15pm

v2