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[.net] RangeValidator not validating...

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Protected Sub cmdB8_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdB8.Click

        RangeValidator6.MinimumValue = txtB8Min.Text
        RangeValidator6.MaximumValue = txtB8Max.Text
        RangeValidator6.Type = ValidationDataType.Double
        Dim clearance As Double = Double.Parse(txtB6.Text) - Double.Parse(txtB7.Text)
        txtB8.Text = clearance.ToString()


        If (RangeValidator6.IsValid = False) Then
            txtB8.BackColor = Drawing.Color.Red
            txtB8.BackColor = Drawing.Color.White
        End If
    End Sub
IsValid keeps coming up as True, even though it should be False. What am I missing? If it helps the textboxes and buttons are in an updatepanel that's in a tabpanel. And validators are just in a tabpanel.

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Is your UpdatePanel's UpdateMode set to Always? If not, it may be that the validator isn't seeing a value in txtB8. That would result in a false positive since validation always succeeds on an empty control (unless you use a RequiredFieldValidator).

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