FarPoint.Excel.ExcelWarningList warningList = new FarPoint.Excel.ExcelWarningList();
fpSpread1.OpenExcel("c:\\test.xlsx", FarPoint.Excel.ExcelOpenFlags.NoFlagsSet, warningList);
if (warningList.Count > 0)
for (int i = 0; i < warningList.Count; i++)
MessageBox.Show(warningList[i].Message);