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[RESOLVED] reliable decimal to fraction converter

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I have some code for converting a decimal to a fraction:

Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim input As Decimal
    If Decimal.TryParse(TextBox1.Text, input) Then
        Dim denominator As Integer = 1

        Do Until input Mod 1 = 0
            input *= 10
            denominator *= 10
        Loop

        Dim numerator As Integer = CInt(input)

        Dim hcd As Integer = Enumerable.Range(2, Math.Min(numerator, denominator)).LastOrDefault(Function(x) numerator Mod x = 0 AndAlso denominator Mod x = 0)
        If hcd <> 0 Then
            Label2.Text = String.Format("Simplest Form: {0}/{1}", numerator \ hcd, denominator \ hcd)
        Else
            Label2.Text = String.Format("Simplest Form: {0}/{1}", numerator, denominator)
        End If
    End If
End Sub

it works great for decimals such as 1.125, but can't handle infinite decimals such as 1/3
can anyone tell me how to adjust for fractions such as 1/3 or 1/7?

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