Export Datatable to Excel with Epplus

Export DataTable to Excel with EPPlus

using (ExcelPackage pck = new ExcelPackage(newFile))
{
  ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Accounts");
  ws.Cells["A1"].LoadFromDataTable(dataTable, true);
  pck.Save();
}

That should do the trick for you. If your fields are defined as int EPPlus will properly cast the columns into a number or float.

Export data table to Excel sheet

Since you haven't mentioned if excel is installed, i recommend EPPlus to create the excel file. It has a convenient method LoadFromDataTable:

using (var pck = new ExcelPackage())
{
    var ws = pck.Workbook.Worksheets.Add("Worksheet-Name");
    ws.Cells["A1"].LoadFromDataTable(dataTable1, true, OfficeOpenXml.Table.TableStyles.Medium1);
    using(var fileStream = File.Create(path))
        pck.SaveAs(fileStream);
}

Edit i've only just seen that you have tagged export-to-csv.

var lines = dataTable1.AsEnumerable()
    .Select(r => string.Join(",", r.ItemArray));
string csv = string.Join(Environment.NewLine, lines);

File.AppendAllText(path, csv);

Excel to DataTable using EPPlus - excel locked for editing

I see, that's what i've posted recently here(now corrected). It can be improved since the ExcelPackage and the FileStream(from File.OpenRead) are not disposed after using.

public static DataTable GetDataTableFromExcel(string path, bool hasHeader = true)
{
    using (var pck = new OfficeOpenXml.ExcelPackage())
    {
        using (var stream = File.OpenRead(path))
        {
            pck.Load(stream);
        }
        var ws = pck.Workbook.Worksheets.First();  
        DataTable tbl = new DataTable();
        foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
        {
            tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
        }
        var startRow = hasHeader ? 2 : 1;
        for (int rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
        {
            var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
            DataRow row = tbl.Rows.Add();
            foreach (var cell in wsRow)
            {
                row[cell.Start.Column - 1] = cell.Text;
            }
        }
        return tbl;
    }
}

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