System.FormatException : Input string was not in a correct format ,on converting string to decimal.

Question

I have a little problem with ASP.NET and C#. This is my error code:

An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in >user code

Additional information: Input string was not in a correct format.

protected void Page_Load(object sender, EventArgs e)
{
    if(this.IsPostBack == false)
    {
        Currency.Items.Add(new ListItem("Euro", "0.85"));
        Currency.Items.Add(new ListItem("Yen", "11.30"));
        Currency.Items.Add(new ListItem("PLN", "4.20"));
        Currency.Items.Add(new ListItem("GBP", "5.62"));
    }
}

protected void Convert_Click(object sender, EventArgs e)
{
    decimal oldAmount;
    bool succes = Decimal.TryParse(TextBox.Value, out oldAmount);

    if(succes)
    {
        ListItem item = Currency.Items[Currency.SelectedIndex];
        decimal newAmount = oldAmount * decimal.Parse(item.Value);
        Result.InnerText = "Result: " + newAmount;
    }

}

I tried Decimal.Parse, Decimal.TryParse and other strange combinations. Now I'm sure that issue is with strings and parsing them to decimal. When I created String variable - there was that same error while parsing. So can someone tell me what to do to be able to convert String to decimal?

Jakob Christensen - yes, and I cant see anything strange. When app is on line decimal newAmount ... it throws error beacuse string is in wrong format but I don't know why. — user2855304
– user2855304, Commented Apr 17, 2014 at 10:30
What does the string for item.Value look like on the decimal newAmount = line? — Mashton
– Mashton, Commented Apr 17, 2014 at 10:36

Community · Accepted Answer · 2017-05-23 11:53:50Z

7

Try using "0,85" instead of "0.85". I think you can use the dot decimal if you change culture. Here is some more information: How to change symbol for decimal point in double.ToString()?

edited May 23, 2017 at 11:53

CommunityBot

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answered Apr 17, 2014 at 10:30

sn1ckers

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Comments

Jayesh Goyani · Accepted Answer · 2014-04-17 10:43:15Z

2

Please try with the below code snippet.

CultureInfo info = CultureInfo.GetCultureInfo("es-ES");
string storedValue = "3,85";
decimal oldAmount;
bool succes = Decimal.TryParse(storedValue, NumberStyles.Any, info, out oldAmount);

edited Apr 17, 2014 at 10:43

answered Apr 17, 2014 at 10:26

Jayesh Goyani

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3 Comments

user2855304 Over a year ago

The problem is not with TextBox - Im using html controls so TextBox as ID works just fine. The problem is in Decimal.Parse(SomeString).

Jayesh Goyani Over a year ago

please provide your textbox's value.

user2855304 Over a year ago

I don't use textbox. On this page I was using <input type="text" id="TextBox" runat="server" />. Anyway - Sn1ckers help me with the issue - problem was in my culture sign. Instead of 0.85 i should use 0,85.

David Brossard · Accepted Answer · 2014-04-17 10:26:05Z

0

Use TextBox.Text instead:

bool succes = Decimal.TryParse(TextBox.Text, out oldAmount);

answered Apr 17, 2014 at 10:26

David Brossard

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Comments

Usman Tariq · Accepted Answer · 2014-04-17 10:29:52Z

0

TextBox.value is wrong. YourTextBox.Text is correct...!

bool success = Decimal.TryParse(TextBox.Text, out oldAmount);

answered Apr 17, 2014 at 10:29

Usman Tariq

439 bronze badges

1 Comment

Jayesh Goyani Over a year ago

Same answer is already provided by '@David Brossard' before 3 minutes.

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