Parse a double

Hi,

I try to parse a double.

            {
                btnSwUnit.Text = "Switch to mg/dl";
                lblSwUnit.Text = "Glucose Units: mmol/l";
                MessageBox.Show("Waardes als form opstart" + Properties.Settings.Default.IsMGDL);
                if (Double.TryParse(Properties.Settings.Default.MinVal, NumberStyles.Any, ci, out MinVal)) 
                this.spdMinVal.EditValue = MinVal.ToString();
                if (Double.TryParse(Properties.Settings.Default.MinRng, NumberStyles.Any, ci, out MinRng)) 
                this.spdMinRng.EditValue = MinRng.ToString();
                if (Double.TryParse(Properties.Settings.Default.MaxRng, NumberStyles.Any, ci, out MaxVal)) 
                this.spdMaxRng.EditValue = MaxRng.ToString();
                if (Decimal.TryParse(Properties.Settings.Default.MaxVal, NumberStyles.Any, ci, out MaxRng)) 
                this.spdMaxVal.EditValue = MaxVal.ToString(); 
            }

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But I get this error:

The name 'NumberStyles' does not exist in the current context      

What can i do about this?

Greetings,

Peter Kiers