求教，用C#如何修改excel表格中指定单元格中

Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Sheets sheets;
Microsoft.Office.Interop.Excel.Workbook workbook = null;
//打开Excel应用
workbook = app.Workbooks.Open(excelPath, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong);
sheets = workbook.Worksheets;
//读取第一张表
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)sheets.get_Item(1);
Microsoft.Office.Interop.Excel.Range range;
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1];
//A1写入hello
range.Text="hello";

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