Saving the Excel document

//Using File.WriteAllBytes
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create a new Worksheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some text to cell A1
    worksheet.Cells["A1"].Value = "My second EPPlus spreadsheet!";

    //convert the excel package to a byte array
    byte[] bin = excelPackage.GetAsByteArray();

    //the path of the file
    string filePath = "C:\\ExcelDemo.xlsx";

    //or if you use asp.net, get the relative path
    filePath = Server.MapPath("ExcelDemo.xlsx");

    //write the file to the disk
    File.WriteAllBytes(filePath, bin);

    //Instead of converting to bytes, you could also use FileInfo
    FileInfo fi = new FileInfo(filePath);
    excelPackage.SaveAs(fi);
}

//Using SaveAs
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create a new Worksheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some text to cell A1
    worksheet.Cells["A1"].Value = "My second EPPlus spreadsheet!";
    //the path of the file
    string filePath = "C:\\ExcelDemo.xlsx";

    //or if you use asp.net, get the relative path
    filePath = Server.MapPath("ExcelDemo.xlsx");

    //Write the file to the disk
    FileInfo fi = new FileInfo(filePath);
    excelPackage.SaveAs(fi);
}

//create a new ExcelPackage
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create the WorkSheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some text to cell A1
    worksheet.Cells["A1"].Value = "My second EPPlus spreadsheet!";

    //convert the excel package to a byte array
    byte[] bin = excelPackage.GetAsByteArray();

    //clear the buffer stream
    Response.ClearHeaders();
    Response.Clear();
    Response.Buffer = true;

    //set the correct contenttype
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

    //set the correct length of the data being send
    Response.AddHeader("content-length", bin.Length.ToString());

    //set the filename for the excel package
    Response.AddHeader("content-disposition", "attachment; filename=\"ExcelDemo.xlsx\"");

    //send the byte array to the browser
    Response.OutputStream.Write(bin, 0, bin.Length);

    //cleanup
    Response.Flush();
    HttpContext.Current.ApplicationInstance.CompleteRequest();
}

//Using File.WriteAllBytes
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create a new Worksheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some text to cell A1
    worksheet.Cells["A1"].Value = "My fourth EPPlus spreadsheet!";

    //convert the excel package to a byte array
    byte[] bin = excelPackage.GetAsByteArray();

    //create a SaveFileDialog instance with some properties
    SaveFileDialog saveFileDialog1 = new SaveFileDialog();
    saveFileDialog1.Title = "Save Excel sheet";
    saveFileDialog1.Filter = "Excel files|*.xlsx|All files|*.*";
    saveFileDialog1.FileName = "ExcelSheet_" + DateTime.Now.ToString("dd-MM-yyyy") + ".xlsx";

    //check if user clicked the save button
    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
    {
        //write the file to the disk
        File.WriteAllBytes(saveFileDialog1.FileName, bin);
    }
}

//Using SaveAs
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create a new Worksheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some text to cell A1
    worksheet.Cells["A1"].Value = "My fourth EPPlus spreadsheet!";

    //create a SaveFileDialog instance with some properties
    SaveFileDialog saveFileDialog1 = new SaveFileDialog();
    saveFileDialog1.Title = "Save Excel sheet";
    saveFileDialog1.Filter = "Excel files|*.xlsx|All files|*.*";
    saveFileDialog1.FileName = "ExcelSheet_" + DateTime.Now.ToString("dd-MM-yyyy") + ".xlsx";

    //check if user clicked the save button
    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
    {
        //Get the FileInfo
        FileInfo fi = new FileInfo(saveFileDialog1.FileName);
        //write the file to the disk
        excelPackage.SaveAs(fi);
    }
}