FormatException: Input string was not in a correct format.

[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

 

[Ken Cox [Microsoft MVP]]

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]

 

[Maria]

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

 

[Guest]

Probably you are typing an invalid number in the txtCelsius.Text like 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 is a good best practises guide : http://www.dotnetspider.com/Technology/Tutorials/BestPractices.asp

 

[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

Probably you are typing an invalid number in the txtCelsius.Text like

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

is a good best practises guide :
http://www.dotnetspider.com/Technology/Tutorials/BestPractices.aspx