Module Module1 Sub Main() 'Create a new workbook. Dim Wbook = New ExcelWorkbook() 'Add new worksheet to workbook. Wbook.Worksheets.Add("Sheet1") Wbook.Worksheets(0).Cells("A1").Value = "Hello, world!" 'XLS Wbook.WriteXLS("..\..\..\FirstExcelFiles.xls") 'XLSX Wbook.WriteXLSX("..\..\..\FirstExcelFiles.xlsx") 'Open specified file in MS Excel. System.Diagnostics.Process.Start("..\..\..\FirstExcelFiles.xlsx") End Sub End Module