Hi.

With Microsoft interop Excel object, we can use this code( Excel.Range.value with Array )

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 DataSet dsExcel = MakeDataSet() 

 int DtColLength; 

 int DtRowLength;

  Excel.Range cel = worksheet.get_Range(app.ActiveCell, app.ActiveCell.get_Offset(DtRowLength - 1, DtColLength - 1)); //starting point

           string[,] MyArray = new string[DtRowLength, DtColLength        

              for (int i = 1; i < DtColLength + 1; i++)
                {
                    for (int j = 1; j < DtRowLength + 1; j++)
                    {
                        MyArray[j - 1, i - 1] = dsExcel.Tables[0].Rows[j - 1][i - 1].ToString();
                    }
                }
                cel.Value2 = MyArray;// Databind
                cel.Columns.AutoFit();  

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but I have no idea with "Infragistics.Excel.Workbook" object.

Thanks in advance.