static void Main(string[] args) { List <ExcelColumn> columns = new List <ExcelColumn>() { new ExcelColumn { ColumnName = "Name" }, new ExcelColumn { ColumnName = "Customer Reference Number" }, new ExcelColumn { ColumnName = "Gender", ValidationDataSet = new List <string>() { "Male", "Female" } } }; using (IExcelGenerator generator = new ExcelGenerator("anand.xlsx", "serviceSheet", "data")) { ExcelColumns excelColumns = new ExcelColumns(columns); var dataPopulater = generator.GetExcelDataPopulater(excelColumns); dataPopulater.PopulateData(); generator.NativeExcelPackageObject.SaveAs(new FileInfo("./students.xlsx")); } }