[C#]

   1: //create a workbook 

   2:  XlsWorkbook workbook = new XlsWorkbook();

   3:  //get a worksheet           

   4:  XlsWorksheet sheet = workbook.Worksheets[0];

   5:  //merge A1:D1

   6:  sheet.Range["A1:D1"].Merge();

   7:  //assign text to the range

   8:  sheet.Range["A1:D1"].Text = "Hello, world!";

   9:  //save the workbook

  10:  workbook.Save("helloworld.xls");

[VB.NET]

 1: 'create a workbook 

 2: Dim workbook As New XlsWorkbook 

 3: Dim sheet As XlsWorksheet = workbook.Worksheets(0)

 4: 'merge A1:D1 

 5: sheet.Range("A1:D1").Merge()

 6: 'assign text to the range 

 7: sheet.Range("A1:D1").Text = "Hello, world!"

 8: 'save the workbook 

 9: workbook.Save("helloworld.xls")