Odd error when setting Textbox.Text in VB2008

Odd error when setting Textbox.Text in VB2008

I am converting a Smart Device app to a Windows app and I encountered
an odd error in my new Windows version.   The line that gives me the
error is:

SceneWidth.Text = 180

where SceneWidth is a Textbox.  And the error is:  Conversion from
string "" to type 'Double' is not valid."

Even though it didn't make sense because I was converting an Integer
to a String and not a String to a Double, I tried this:

SceneWidth.Text = "180"

And I get the same error.  FWIW, the textbox is preinitialized with a
different value.

So what is the real problem here?

date: Fri, 20 Jun 2008 18:05:46 -0700 (PDT) author: silverfox

Re: Odd error when setting Textbox.Text in VB2008

On Jun 20, 6:05 pm, silverfox  wrote:
> I am converting a Smart Device app to a Windows app and I encountered
> an odd error in my new Windows version.   The line that gives me the
> error is:
>
> SceneWidth.Text = 180
>
> where SceneWidth is a Textbox.  And the error is:  Conversion from
> string "" to type 'Double' is not valid."
>
> Even though it didn't make sense because I was converting an Integer
> to a String and not a String to a Double, I tried this:
>
> SceneWidth.Text = "180"
>
> And I get the same error.  FWIW, the textbox is preinitialized with a
> different value.
>
> So what is the real problem here?

Update on this problem:

It was always failing on the first instruction that referred to the
particular form that contained the TextBox and was unrelated to the
TextBox.  The problem occurred in the process of instantiating the
Form.  I could not find anything about the form that caused the
problem but I removed it from the project and created another one that
I believe is identical to the first.  Obviously it is not though,
because the problem went away.  I would like to know what caused the
error, but now that I am past it, it isn't so pressing.

date: Fri, 20 Jun 2008 19:41:20 -0700 (PDT) author: silverfox

Re: Odd error when setting Textbox.Text in VB2008

On Jun 20, 7:41 pm, silverfox  wrote:
> On Jun 20, 6:05 pm, silverfox  wrote:
>
>
>
> > I am converting a Smart Device app to a Windows app and I encountered
> > an odd error in my new Windows version.   The line that gives me the
> > error is:
>
> > SceneWidth.Text = 180
>
> > where SceneWidth is a Textbox.  And the error is:  Conversion from
> > string "" to type 'Double' is not valid."
>
> > Even though it didn't make sense because I was converting an Integer
> > to a String and not a String to a Double, I tried this:
>
> > SceneWidth.Text = "180"
>
> > And I get the same error.  FWIW, the textbox is preinitialized with a
> > different value.
>
> > So what is the real problem here?
>
> Update on this problem:
>
> It was always failing on the first instruction that referred to the
> particular form that contained the TextBox and was unrelated to the
> TextBox.  The problem occurred in the process of instantiating the
> Form.  I could not find anything about the form that caused the
> problem but I removed it from the project and created another one that
> I believe is identical to the first.  Obviously it is not though,
> because the problem went away.  I would like to know what caused the
> error, but now that I am past it, it isn't so pressing.

There is still a mystery.  I discovered that setting the Text property
in the constructor of one and only one of the several TextBox causes
this problem.  I could find nothing unusual about the TextBox that was
causing the problem, but if I deleted it and copied  and pasted
another TextBox, using the Designer, I made the problem go away.

date: Fri, 20 Jun 2008 21:03:01 -0700 (PDT) author: silverfox