請教一下各位，我利用NPOI產生一個.xlsx的檔案匯出，用Excel開啟都會提示有部分內容有問題，要嘗試修復，是否信任這個活頁部的來源。
按下是之後，雖然有正常打開，但是會有下列訊息 "Excel 已完成檔案層級的驗證和修復。此活頁簿的某些部分可能已經修復或遺失。"

excel 的版本是2019標準版

以下是我的部分程式碼

public void WriteExcelWithNPOI(string extension, string filename, DataTable dt)
{
    IWorkbook workbook;

    if (extension == "xlsx")
    {
        workbook = new XSSFWorkbook();
    }
    else if (extension == "xls")
    {
        workbook = new HSSFWorkbook();
    }
    else
    {
        throw new Exception("This format is not supported");
    }

    ISheet sheet1 = workbook.CreateSheet(filename);

    IRow row1 = sheet1.CreateRow(0);
    for (int j = 0; j < dt.Columns.Count; j++)
    {
        ICell cell = row1.CreateCell(j);

        String columnName = dt.Columns[j].ToString();
        cell.SetCellValue(columnName);
    }
    for (int i = 0; i < dt.Rows.Count; i++)
    {
        IRow row = sheet1.CreateRow(i + 1);
        for (int j = 0; j < dt.Columns.Count; j++)
        {
            ICell cell = row.CreateCell(j);
            String columnName = dt.Columns[j].ToString();
            if (j == 0)
            {
                cell.SetCellValue(DateTime.Parse(dt.Rows[i][columnName].ToString()).ToString("yyyy/MM/dd").Trim());
            }
            else
            {
                cell.SetCellValue(dt.Rows[i][columnName].ToString().Trim());
            }

        }

    }
   
    var context = HttpContext.Current;
    context.Response.Clear();
    context.Response.ContentType = "application/vnd.ms-excel";
    context.Response.AppendHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
    using (var ms = new MemoryStream())
    {
        workbook.Write(ms);
        
        context.Response.AddHeader("Content-Length", (ms.ToArray().Length).ToString());
        context.Response.BinaryWrite(ms.GetBuffer());
        context.ApplicationInstance.CompleteRequest();
        context.Response.Output.Flush();
    }
    
    }