次のサンプルコードは、指定した列のインデックスを返します。
FarPoint.Win.Spread.Model.DefaultSheetDataModel dm;
dm = fpSpread1.ActiveSheet.Models.Data;
int i = dm.GetColumnIndex("EmployeeID");
fpSpread1.ActiveSheet.Columns[i].ForeColor = Color.Red;
Dim dm As FarPoint.Win.Spread.Model.DefaultSheetDataModel
dm = FpSpread1.ActiveSheet.Models.Data
Dim i As Integer = dm.GetColumnIndex("EmployeeID")
FpSpread1.ActiveSheet.Columns(i).ForeColor = Color.Red