Exporting a Datatable to Excel C#

I need to put data in the first 5 columns of a datatable into excel usin C#. I tried to start writing it, but I am stuck. I am not an expert at this stuff by no means here is what I have so far:

app = new Excel.Application();
            workbook = app.Workbooks.Open(inputData.testPath, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows,
              "\t", false, false, 0, true, 0, true);

            Excel.Sheets sheets = workbook.Worksheets;

            Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);

            DataTable outputData = sdc.ResultData.Tables[0];

            Excel.Range theRange = FindPlaceToAppendData(worksheet);

            foreach (DataRow row in outputData.Rows)
            {
                //Insert a new Row in excel
                Excel.Range newRow = theRange.EntireRow;
                newRow.Insert(Excel.XlInsertShiftDirection.xlShiftDown, false);

                //dunno if this code is even right
               //  HERE TRYING TO INSERT A ROW INTO EXCEL THEN FILL THE ROW WITH THE VALUES OF
               // THE ROW IN THE DATATABLE (THE FIRST 5 COLUMNS OF IT)
               // IF THERES A BETTER WAY BY ALL MEANS PLEASE HELP!
                int endIndex = worksheet.Cells.SpecialCells(Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeLastCell,Type.Missing).Column;

                for(int i=0;i<endIndex-1;i++)
                {
                   
                }

                    //Set the range value to the array.
                    theRange.set_Value(Missing.Value, saRet);
                }

            }

            app.Workbooks.Close();
            app.Quit();
            GC.Collect();Start Free Trial