FormatException: Input string was not in a correct format.

  • Thread starter Thread starter Maria
  • Start date Start date
M

Maria

Hello !

I'm a newbie trying to learn something about asp.net. To start with
something easy I made a page that convert from Celsius to Fahrenheit.

The code :

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

Dim x As Double = ((Double.Parse(Me.txtCelsius.Text, NumberStyles.Any) *
1.8) + 32)

Me.txtFarenheit.Text = CType(x, String)

End Sub


But when I try to open the page on the remote server I get this error :

FormatException: Input string was not in a correct format.


I have search the net - but only found info about database and sql.

Can someone guide me in the right direction ??

Maria
 
Hi Maria,

You'll get that error if the txtCelsius is empty. Perhaps you should trap
for an empty string like this?

Private Sub Button1_Click _
(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click
If txtCelsius.Text = "" Then
txtFarenheit.Text = "Please provide a value."
Exit Sub
End If
Dim x As Double = _
((Double.Parse(Me.txtCelsius.Text, _
Globalization.NumberStyles.Any) _
* 1.8) + 32)
Me.txtFarenheit.Text = CType(x, String)
End Sub

Ken
Microsoft MVP [ASP.NET]
 
Hello Ken !

I got this error even if txtCelsius is not empty. But in the
error.descripton there was a reference to my local cache - so I tried to
build the site again, but in a different folder on the remote server.
Exactly the same code - and this time it's ok ? Probably some mistake by me
when I created the site..

Thanks !!

Maria
 
Hello Tojo

Well - I get the same error if I type in a valid numer. But when I
installed it to another folder - it was ok..


Maria


TOJO said:
Probably you are typing an invalid number in the txtCelsius.Text like
Click to expand...
characters etc. I don't see any other reason. Try to debug line by line and
see which line fails.
Just as a side note, you can use x.ToString() to convert into string. Here
Click to expand...
is a good best practises guide :
http://www.dotnetspider.com/Technology/Tutorials/BestPractices.aspx
 
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