Change the height of rows or columns programmatically

Probably lightweight. How do I change columns or columns?

 xlApp = new Excel.Application();
 xlApp.Visible = true;
 xlApp.DisplayAlerts = false;
 Excel.Workbooks xlWorkBooks = xlApp.Workbooks;
 xlWorkBook = xlWorkBooks.Open(directoryPath + "\\" + fileName, 0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);

 xlWorkSheets = xlWorkBook.Worksheets; //Get all the sheets in the workbook
 xlWorkSheet = (Excel.Worksheet)xlWorkSheets.get_Item("Sheet1"); //Get the allready exists sheet
 Excel.Range range = xlWorkSheet.UsedRange;
 Excel.Range chartRange;

 int colCount = range.Columns.Count;
 int rowCount = range.Rows.Count;

  xlWorkSheet.Cells[rowCount + 5, 1] = "Name and surname";
  chartRange = xlWorkSheet.get_Range("a" + (rowCount + 5), "e" + (rowCount + 5));
  chartRange.Font.Bold = true;

 xlWorkBook.SaveAs(fileName, Excel.XlFileFormat.xlOpenXMLWorkbook, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
  xlWorkBook.Close(misValue, misValue, misValue);
  xlWorkSheet = null;
  xlWorkBook = null;
  xlApp.Quit();

  GC.WaitForPendingFinalizers();
  GC.Collect();
  GC.WaitForPendingFinalizers();
  GC.Collect();

      

        
        
        
      

    

Try with help xlWorkSheet.UsedRange.EntireRow.Height = value;

, but it won't work. autoFit()

works, but I would like to work with my value.