Input string was not in a correct format when converting to integer

Question

In line:

int d = Convert .ToInt32 ( TxtAmount.Text);

there is an error

Input string was not in a correct format

I want to convert the number inside TxtAmount.Text. if it's a negative number to decimal or integer without - and then convert it again to string because ConvertNumbersToArabicAlphabet the parameter is string.

int d = Convert .ToInt32 ( TxtAmount.Text);
ConvertNumbersToArabicAlphabet a = new ConvertNumbersToArabicAlphabet(d.ToString());
Label2.Text = a.GetNumberAr();

And why do you want to convert string to number and then convert that number to string? Just use new ConvertNumbersToArabicAlphabet(TxtAmount.Text); — Nikolay Kostov
– Nikolay Kostov, Commented Feb 12, 2015 at 9:16
What is the value of TxtAmount.Text and what is your CurrentCulture? Debug your code and tell us. — Soner Gönül
– Soner Gönül, Commented Feb 12, 2015 at 9:17
Possible doublicate ? : stackoverflow.com/questions/10507759/… — Aristos
– Aristos, Commented Feb 12, 2015 at 9:18

Thorsten Dittmar · Accepted Answer · 2015-02-12 13:36:56Z

1

I'd check whether the input is numeric first and then convert, using Math.Abs to make sure the result is always a positive number:

int result = 0;

// Does text contain numbers only (and maybe a leading "-")?
if (Regex.IsMatch(TxtAmount.Text, @"^-?[0-9]+$"))
{
    // Try to parse an int from it. If successful, convert it to
    // a positive number in any case (= ignore the leading "-")
    if (Int32.TryParse(TxtAmount.Text, out result))
        result = Math.Abs(result);
}

// In all other cases, the result is 0
return result;

answered Feb 12, 2015 at 13:36

Thorsten Dittmar

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Comments

A.D. · Accepted Answer · 2015-02-12 09:20:52Z

0

int d = Convert .ToInt ( TxtAmount.Text);

You can use this if you have a Integer Value within the textbox . If text area contain only a single character then it's not work anymore.

try to put only Integer of same type of data you want to convert in to textbox

like if you want to add a double number then you can use.

Double num = Convert .ToDouble ( TxtAmount.Text);

if your textbox is empty may sure that you have validation or check for the same:

if(TxtAmount.Text==""||TxtAmount.Text=string.Empty)
{
    TxtAmount.Text=0;
}
else
{
  int d = Convert .ToInt ( TxtAmount.Text); 
}

answered Feb 12, 2015 at 9:20

A.D.

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1 Comment

Thorsten Dittmar Over a year ago

TxtAmount.Text == "" and TxtAmount.Text == String.Empty are the same thing. It's better to use String.IsNullOrWhiteSpace(TxtAmount.Text).

Jayanta Dey · Accepted Answer · 2015-02-12 13:34:52Z

0

If all you want is to ignore the negative sign, then you can do string manipulation like:

string value = TxtAmount.Text;
if (value.StartsWith("-"))
{
    value = value.Substring(1);
}

answered Feb 12, 2015 at 13:34

Jayanta Dey

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Comments

Midhun Mundayadan · Accepted Answer · 2015-02-12 13:37:08Z

0

This is because Youse textbox is empty. check weather your textbox have values or not

if(!String.IsNullOrWhiteSpace(TxtAmount.Text))
{
   int d = Convert .ToInt32 ( TxtAmount.Text); 
}

edited Feb 12, 2015 at 13:37

answered Feb 12, 2015 at 9:18

Midhun Mundayadan

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1 Comment

Thorsten Dittmar Over a year ago

As it doesn't work if the text box contains only spaces, it's better to use if (!String.IsNullOrWhiteSpace(TxtAmount.Text)).

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