``` //create a new workbook var workbook = new GrapeCity.Documents.Excel.Workbook(); IWorksheet worksheet = workbook.Worksheets; worksheet.Range["E4:J5"].Value = new object[,] { {1, 2, 3}, {4, 5, 6} }; worksheet.Range["I6:J8"].Value = new object[,] { {2, 2}, {3, 3}, {4, 4} }; //O P Q //2 4 #N/A //12 15 #N/A //#N/A #N/A #N/A worksheet.Range["O9:Q11"].FormulaArray = "=E4:G5*I6:J8"; //judge if Range O9 has array formula. if (worksheet.Range["O9"].HasArray) { //set O9's entire array's interior color. var currentarray = worksheet.Range["O9"].CurrentArray; currentarray.Interior.Color = Color.Green; } //save to an excel file workbook.Save("usearrayformula.xlsx"); ``` ``` ' Create a new Workbook Dim workbook As New Workbook Dim worksheet As IWorksheet = workbook.Worksheets(0) worksheet.Range("E4:J5").Value = New Object(,) { {1, 2, 3}, {4, 5, 6} } worksheet.Range("I6:J8").Value = New Object(,) { {2, 2}, {3, 3}, {4, 4} } 'O P Q '2 4 #N/A '12 15 #N/A '#N/A #N/A #N/A worksheet.Range("O9:Q11").FormulaArray = "=E4:G5*I6:J8" 'judge if Range O9 has array formula. If worksheet.Range!O9.HasArray Then 'set O9's entire array's interior color. Dim currentarray = worksheet.Range!O9.CurrentArray currentarray.Interior.Color = Color.Green End If ' save to an excel file workbook.Save("usearrayformula.xlsx") ```