Convert Text to Single -- Convert.ToSingle -- Input string was not in a correct format

Posted on 2006-11-09
Last Modified: 2008-01-09
I have a textbox "MyBox" that users input text into. In this case, it is numeric (for which I can ignore non-numeric input, but that's not the question). I do something like this:

MyValue = Convert.ToSingle(MyBox.Text)

However, if the text is empty or alphabetic (e.g., "Hello, world."), I get an error "Input string was not in a correct format." Of course, I can pre-test for that, but I was wondering if there was some easy step that I was overlooking, like one that change non-numeric values to zero instead.
Question by:GivenRandy
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LVL 35

Expert Comment

ID: 17908924
if not MyBox.Text="" then
      MyValue = Convert.ToSingle(MyBox.Text)
end if
LVL 35

Accepted Solution

YZlat earned 500 total points
ID: 17908941
If IsNumeric(MyBox.Text) And Not Trim(MyBox.Text) = "" Then
     MyValue = Convert.ToSingle(MyBox.Text)
end if

Author Comment

ID: 17909189
The second post is how I'm doing it, now (with IsNumeric). Probably not any better way.
LVL 35

Expert Comment

ID: 17909237
how much better do you want it to get?

Expert Comment

ID: 17909239

   MyValue = Convert.ToSingle(MyBox.Text)
   MyValue = 0
End Try

That way you don't have to do 2 checks, you just go ahead and do it and treat any failure as a 0.

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