How do I convert this exponential number?

I have this number -1.34152189427569E+34 that I am trying to convert into a number I can use, but with the code below I just get it as a double, with the exponent on the end. I tried converting it to a decimal number type, but no dice. Help!

Dim a As Double
        Dim num As String
        Dim conv As Double

        readcffile(1, 0) ' ignore
        a = calculate(8520322, 6457197, 1, 0) ' ignore
        num = a.ToString
        TextBox1.Text = num

        conv = Double.Parse(num, Globalization.NumberStyles.Float)


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Mike TomlinsonMiddle School Assistant TeacherCommented:
Like this?...

        Dim strNum As String = "-1.34152189427569E+34"
        Dim dbl As Double = Double.Parse(strNum)
        Dim strDbl As String = dbl.ToString("n")
        MsgBox(dbl.ToString & " = " & strDbl)

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Visual Basic.NET

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