Round off a number after a calculation.

Hi,

I am programming in VS2010 with C#.
I have this code:

            if (e.Column.FieldName == "Value")
            {
                if ((Properties.Settings.Default.IsMGDL == false) && (CheckType(e.Value.ToString()) == false))
                {
                    int eValue = Convert.ToInt32(e.Value) / 18;
                    e.DisplayText = (eValue).ToString();
                }
                else if ((Properties.Settings.Default.IsMGDL == true) && (CheckType(e.Value.ToString()) == true))
                {
                    double eValue = Convert.ToDouble(e.Value) * 18;
                    e.DisplayText = (eValue).ToString();
                }
            }

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In the first condition the calculated number has to round up in 1 decimal after the period.
or in my case the comma (f.e: 6,66666 has to be 6,7)

And in the second condition the calculated number as to round up as a whole number.
(f.e: 6,66666 has to be 7)

I hope I have explained it right!

How can I do that?

Peter