How to save a value into only one excel`s cell ?

using Excel = Microsoft.Office.Interop.Excel;

Excel.Application xlApp; 
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
Excel.Range range;
object misValue = System.Reflection.Missing.Value;

xlApp = new Excel.ApplicationClass();   // new Excel Application Class
xlWorkBook = xlApp.Workbooks.Open(@"" + path, 0, false, 5, "" + password, "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);    // Definations
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(page);   // Which Excel.Page
range = xlWorkSheet.UsedRange;

xlWorkSheet.get_Range("" + column + row, misValue).Formula = "" + value;

xlWorkBook.Save();      // Save the data

xlWorkBook.Close(true, @"" + path, false);     // Closing th excel.workbook
xlWorkSheet = null;
xlApp.Workbooks.Close();
xlApp.Quit();