'Error: Input string is not in the correct format

I am new to coding so please help me out, the error appears on the commented line below:

private void order_Click(object sender, EventArgs e)

        {
            double[] itemcost = new double[2000];
            itemcost[0] = Convert.ToDouble(pep.Text) * price_pep; // Error here
            itemcost[2] = Convert.ToDouble(all.Text) * price_all;
            itemcost[3] = Convert.ToDouble(haw.Text) * price_haw;
            itemcost[4] = Convert.ToDouble(veg.Text) * price_veg;
            itemcost[5] = Convert.ToDouble(bre.Text) * price_bre;
            itemcost[6] = Convert.ToDouble(chi.Text) * price_chi;
            itemcost[7] = Convert.ToDouble(pot.Text) * price_pot;
            itemcost[8] = Convert.ToDouble(bot.Text) * price_bot;
            itemcost[9] = Convert.ToDouble(cok.Text) * price_cok;
            itemcost[10] = Convert.ToDouble(mou.Text) * price_mou;
        }

This is the error that appears:

this is the error that appears

c++sharpvisual-studio


Solution 1:[1]

You have a conversion error so what this means is your input string it failed to convert to a double. You should make sure that your variable called pep is a number.

Solution 2:[2]

This error is caused because the input type cannot be converted to double type, I make a similar code to reproduce the issue, here is my test result? enter image description here

We can add try catch to solve this problem, such as:

private void order_Click(object sender, EventArgs e)
    {
        try
        {
            double[] itemcost = new double[2000];
            itemcost[0] = Convert.ToDouble(pep.Text) * price_pep; 
            itemcost[2] = Convert.ToDouble(all.Text) * price_all;
            itemcost[3] = Convert.ToDouble(haw.Text) * price_haw;
            itemcost[4] = Convert.ToDouble(veg.Text) * price_veg;
            itemcost[5] = Convert.ToDouble(bre.Text) * price_bre;
            itemcost[6] = Convert.ToDouble(chi.Text) * price_chi;
            itemcost[7] = Convert.ToDouble(pot.Text) * price_pot;
            itemcost[8] = Convert.ToDouble(bot.Text) * price_bot;
            itemcost[9] = Convert.ToDouble(cok.Text) * price_cok;
            itemcost[10] = Convert.ToDouble(mou.Text) * price_mou;
        }
        catch
        {
            MessageBox.Show("Please enter the correct number");
        }
    }

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Diego_San
Solution 2 Jingmiao Xu-MSFT

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