Help needed with methode

Hi,
In my methode CustomColumnDisplayText I tried to call
for the function checktype. The purpose of this function
is to check if a string contains a comma (,) or a (.) if so then
false otherwise true. But I don't know how to call for this
function in the customcolumndisplay-event. And the declaration
in the customcolumndisplay-event to devide and multilpy the
value isn't correct either.

 private void gridView1_CustomColumnDisplayText(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDisplayTextEventArgs e)
        {
            if (e.Column.FieldName == "Value")
            {
                if ((Properties.Settings.Default.IsMGDL == false) || (CheckType = true))
                {
                    e.DisplayText = (e.Value / 18).ToString();
                }
                else if ((Properties.Settings.Default.IsMGDL == true) || (CheckType = false))
                {
                    e.DisplayText = (e.Value * 18).ToString();
                }
            }

        }
        //*-------------------------------------------------------------*//
        static bool CheckType(string value)
        {
            return value.Contains(",") || value.Contains(".");
        }
        //*-------------------------------------------------------------*//

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ERRORS:

1. Cannot assign to 'CheckType' because it is a 'method group'
2. Operator '/' cannot be applied to operands of type 'object' and 'int'      
3. Cannot assign to 'CheckType' because it is a 'method group'
4. Operator '*' cannot be applied to operands of type 'object' and 'int'      


Who can help me?

Peter