Writing Data to an Existing Excel File in C#

Question

I want to write data to an existing Excel file, whilst preserving the original data.

The file has sheet1; I want to write on sheet2, then save. The problem is that e

Answer 1

Use ClosedXml dll in my case its resolved my problem

 var workbook = new XLWorkbook(fileName);
  var ws1 = workbook.Worksheet(1);
  var ws2 = workbook.Worksheet(2);
  workBook.SaveAs(fileName);

Here is my code:

public void ExcelDataAssign(List ColumnwiseData, int length, DateTime ReportDate, List AmountList, List PeriodDateList, int CellId)
    {
        int PeriodColIndex = 6, Desc1ColIndex = 14, Desc2ColIndex = 11, Desc3ColIndex = 9, PeriodDateColIndex = 7;
        int PeriodRowIndex = 3, Desc1RowIndex = 1, Desc2RowIndex = 1, Desc3RowIndex = 1, PeriodDateRowIndex = 3;


        string cellName = ColumnwiseData[length];
        string CapitiveName = ColumnwiseData[2 * length];
        string DomicileName = ColumnwiseData[3 * length];


        string file = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + @"\Excel\OutputTemplate.xlsx";
        string fileName = file.Replace("bin", "").Replace("Debug", "");
        var workbook = new XLWorkbook(fileName);
        var ws1 = workbook.Worksheet(1);

        ws1.Cell(1, 2).Value = DomicileName;
        ws1.Cell(2, 2).Value = CapitiveName;
        ws1.Cell(3, 2).Value = cellName;
        ws1.Cell(4, 2).Value = ReportDate;

        int amntIncr = 0;
        while (AmountList.Count > amntIncr)
        {
            ws1.Cell(PeriodColIndex, PeriodRowIndex).Value = "Period";
            ws1.Cell(Desc1ColIndex, Desc1RowIndex + 2).Value = AmountList[amntIncr];
            ws1.Cell(Desc2ColIndex, Desc2RowIndex + 2).Value = (AmountList[amntIncr + 1]);
            ws1.Cell(Desc3ColIndex, Desc3RowIndex + 2).Value = (AmountList[amntIncr + 2]);
            PeriodRowIndex++;
            Desc1RowIndex++;
            Desc2RowIndex++;
            Desc3RowIndex++;
            amntIncr = amntIncr + 3;

        }
        int periodDateIncr = 0;
        while (PeriodDateList.Count > periodDateIncr)
        {
            ws1.Cell(PeriodDateColIndex, PeriodDateRowIndex).Value = PeriodDateList[periodDateIncr];
            PeriodDateRowIndex++;
            periodDateIncr = periodDateIncr + 3;
        }

        var ws2 = workbook.Worksheet(2);
        ws2.Cell(1, 2).Value = DomicileName;
        ws2.Cell(2, 2).Value = CapitiveName;
        ws2.Cell(3, 2).Value = cellName;
        ws2.Cell(4, 2).Value = ReportDate;


        SqlParameter paramCellId = new SqlParameter("@CellId", CellId);
        SqlParameter paramReportDate = new SqlParameter("@ReportDate", ReportDate);
        DataTable dt = new DataTable();
        var data = SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, "Usp_inputResult", paramCellId, paramReportDate).Tables[0];


        List lstClmwiseData = new List();

        foreach (DataRow r in data.Rows)
        {
            foreach (DataColumn c in data.Columns)
            {
                lstClmwiseData.Add(r[c].ToString());
            }
        }

        int snoColIndex = 6, GLCodeColIndex = 6, DescriptioColIndex = 6, movementDebitColIndex = 6, movementCreditColIndex = 6, ClosingdebitcolIndex = 6, ClosingCreditColIndex = 6;
        int snoRowIndex = 1, GLCodRowIndex = 2, DescriptioRowIndex = 3, movementDebitRowIndex = 4, movementCreditRowIndex = 5, ClosingdebitRowIndex = 6, ClosingCreditRowIndex = 7;
        int secondSheet = 0;
        int SnoIncrement = 1;
        while (lstClmwiseData.Count > secondSheet)
        {
            ws2.Cell(snoColIndex, snoRowIndex).Value = SnoIncrement;
            ws2.Cell(GLCodeColIndex, GLCodRowIndex).Value = lstClmwiseData[secondSheet];
            ws2.Cell(DescriptioColIndex, DescriptioRowIndex).Value = lstClmwiseData[secondSheet + 1];
            ws2.Cell(movementDebitColIndex, movementDebitRowIndex).Value = lstClmwiseData[secondSheet + 2];
            ws2.Cell(movementCreditColIndex, movementCreditRowIndex).Value = lstClmwiseData[secondSheet + 3];
            ws2.Cell(ClosingdebitcolIndex, ClosingdebitRowIndex).Value = lstClmwiseData[secondSheet + 4];
            ws2.Cell(ClosingCreditColIndex, ClosingCreditRowIndex).Value = lstClmwiseData[secondSheet + 5];
            snoColIndex++;
            GLCodeColIndex++;
            DescriptioColIndex++;
            movementDebitColIndex++;
            movementCreditColIndex++;
            ClosingdebitcolIndex++;
            ClosingCreditColIndex++;
            SnoIncrement++;
            secondSheet = secondSheet + 6;

        }
        string path = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + @"\Downloads\ReportUtitlity";
        if (!Directory.Exists(path))
        {
            Directory.CreateDirectory(path);
        }
        string FileName = workbook.Author + "_" + "Report_"+CellId+ "CellId" +"_" + $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss-fff}";
        workbook.SaveAs(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + @"\Downloads\ReportUtitlity\" + FileName + ".xlsx");
    }