I am working on a page with textboxes that can only accept a certain number
of decimals places.  So I wrote a small function to check the number of
decimals, not counting zeros, as well as range check the entry and then
return the results, based on a parsing method I learned in c++ involving
integer division:

public bool entryCheck(int decimals, double min, double max, TextBox field,
Label error)
{
               bool valid = false;
               if (field.Text != "")
    {
        error.Text = "";
        double entry = double.Parse(field.Text);
        //decimal check
        if ((double)((int)(entry * Math.Pow(10,(decimals + 1))) / 10) != entry *
Math.Pow(10, decimals))
        {
            field.ForeColor = Color.Red;
            error.Text = "Too Many Decimals";
        }
        //range check
        else if (entry < min || entry > max)
        {
            field.ForeColor = Color.Red;
            error.Text = "Invalid Range";
        }
        else
        {
            field.ForeColor = Color.Blue;
            valid = true;
        }
    }
    else
        error.Text = "Required Field"; //error if left blank
           
    return valid;
}

It works beautifully ALMOST all of the time.  For some reason, when the entry
is 2.3, the computer multiplies it by say 10000 and gets 22999.9999, which
obviously won't work and isn't correct.  Does anyone know why this is?
Thanks?