Negative Numbers?

Discussion in 'ASP .Net' started by Charles A. Lackman, Sep 28, 2004.

  1. Hello,

    I have some textboxes that are doing addition:

    Dim AString As Double
    AString = Convert.ToDouble(TextBox1.Text) - Convert.To(DoubleTextBox2.Text)
    TextBox3.Text = AString.ToString("#,##0.00;(#,##0.00);0.00")

    When the result is negative it is displayed as "(46)" or whatever the value
    This makes it impossible to test for a negative number to make further

    TextBox5.text = Convert.ToDouble(TextBox3.text) +

    Is there a work-around for this? I must have negative numbers that can be
    added together.

    Charles A. Lackman, Sep 28, 2004
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  2. Don't save the number in the text box, save it in a variable. Just use the
    textbox for displaying the results.
    Jonathan Allen, Sep 28, 2004
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  3. Charles A. Lackman

    Ben Lucas Guest

    It is displayed as "(46)" beacuse that is what your format specifier
    ("#,##0.00;(#,##0.00);0.00") is asking it to do for negative numbers.

    Since the Convert.ToDouble function does not recognize this format, you
    could check for the format you're looking for and change it appropriately:

    For example:

    string sText = TextBox3.Text
    if (sText.StartsWith("("))
    sText = "-" + sText.Remove("(").Remove(")")
    end if

    TextBox5.text = Convert.ToDouble(sText) + Convert.ToDouble(Textbox4.text)

    Or, probably the better way to do this is to just use the result in AString
    which is already a double and stores the value that you're looking for
    Ben Lucas, Sep 28, 2004
  4. Hi Charles,

    First of all, you're not doing addition; you're doing subtraction. Then,
    when you fill textbox5, you'r trying to convert a string to a double. Try
    debugging, set a few breakpoints, and follow the values.


    Bernie Yaeger
    Bernie Yaeger, Sep 28, 2004
  5. Charles,
    In addition to the other comments.

    Use the Double.Parse overload (instead of Convert.ToDouble) that allows you
    to specify the number style to use when converting, something like:
    Read the help on NumberStyles enum to see what the various options allowed

    Hope this helps
    Jay B. Harlow [MVP - Outlook], Sep 28, 2004
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