Input String was not in correct Format. Please Help

David Laranga

11y1.1kVisual Basic .NET

This is the line of code where i got the error:

private void txtTaxPer_TextChanged(object sender, EventArgs e)

{

try

{

if (string.IsNullOrEmpty(txtTaxPer.Text))

{

txtTaxAmt.Text = "";

txtTotal.Text = "";

return;

}

txtTaxAmt.Text = Convert.ToInt32((Convert.ToInt32(txtSubTotal.Text) * Convert.ToDouble(txtTaxPer.Text) / 100)).ToString() ;

txtTotal.Text = (Convert.ToInt32(txtSubTotal.Text) + Convert.ToInt32(txtTaxAmt.Text)).ToString();

}

catch (Exception ex)

{

MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

8 Replies

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Francis Susaimichael11y ago
txtTaxAmt.Text = Convert.ToInt32((Convert.ToInt32(txtSubTotal.Text) * Convert.ToDouble(txtTaxPer.Text) / 100)).ToString() ; txtTotal.Text = (Convert.ToInt32(txtSubTotal.Text) + Convert.ToInt32(txtTaxAmt.Text)).ToString(); That Line

In your above code, you are trying to convert an "Empty" or invalid input string (like try to convert "34D" to integer) to other datatype (like ToInt32, ToDouble etc). That's the reason you got this error. Try to debug the application and figure it out.

Hope this helps!
0
Priyaranjan K S11y ago
Share the input with us Please.
0
David Laranga11y ago
yes, already tried that fix, but it doesn't work idk why, and im also making sure that i am inputing correct
0
Priyaranjan K S11y ago
Hey David,

Did you try this out ?
Instead of :
Convert.ToDouble(txtTaxPer.Text)

Use
Convert.ToDouble(txtTaxPer.Text, CultureInfo.InvariantCulture);

Also make sure you are using a proper number(Decimal or whatever) in txtTaxPer.

Thanks,
Priyan

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David Laranga11y ago
txtTaxAmt.Text = Convert.ToInt32((Convert.ToInt32(txtSubTotal.Text) * Convert.ToDouble(txtTaxPer.Text) / 100)).ToString() ; txtTotal.Text = (Convert.ToInt32(txtSubTotal.Text) + Convert.ToInt32(txtTaxAmt.Text)).ToString(); That Line
0
Rajeesh Menoth11y ago
Hi,
Which line you got this error ? put a break point and check each line of your code..
check the Textbox value and convert the value into correct format..
0
Priyaranjan K S11y ago
Hi David,

If the was a number and still it was throwing error it could be because of the fact that the conversion uses current locale to do such conversions.Some locale would expect a comma as decimal point. Try to ignore the locale by using the below code and see :

While converting to decimal :
Instead of :
Convert.ToDouble(txtTaxPer.Text)

Use
Convert.ToDouble(txtTaxPer.Text, CultureInfo.InvariantCulture);

Thanks,
Priyan

If you found this useful Please mark this as Answer
0
Priyaranjan K S11y ago
What is the input you were trying with ?
0