Change xls into xlsx using eppplus and C#

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C#

.NET

MS-Excel

I have a problem with my project ,

i want to read xls file using eppplus ,

but it show an error like this

"

Quote:

An exception of type 'System.Exception' occurred in EPPlus.dll but was not handled in user code

Additional information: Can not open the package. Package is an OLE compound document. If this is an encrypted package, please supply the password

how can i solve this?
i read some article, say that eppplus does not support for xls file ,
so i think i should change xls file into xlsx ,
how can i did it?

What I have tried:

this is my code ,

protected void check(object sender, EventArgs e)
      {
          if (FileUpload1.HasFile)
          {
              string filename = "Hr_Report_" + DateTime.Now.ToString("dddd_dd_MMMM_yyyy") + ".xlsx";
              FileUpload1.SaveAs(temp_file + filename);
              string tempfile = temp_file + filename;
              string c = @tempfile;
              DataTable table = new DataTable();

              FileInfo existingFile = new FileInfo(tempfile); //+ FileUpload1.FileName);
              using (ExcelPackage package = new ExcelPackage(existingFile))
              {
                  ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
                  int colCount = worksheet.Dimension.End.Column;
                  int rowCount = worksheet.Dimension.End.Row;
                  table.Columns.Add("Emp_NIK", typeof(string));
                  table.Columns.Add("Timer_Finger", typeof(DateTime));
                  table.Columns.Add("Status", typeof(string));
                  for (int i = 1; i < rowCount; i++)
                  {
                      TableRow row = new TableRow();
                      TableCell cell1 = new TableCell();
                      cell1.Text = worksheet.Cells[i + 1, 2].Text.ToString();//+worksheet.Cells[i + 1, 3].Value.ToString() + " " + worksheet.Cells[i + 1, 2].Value.ToString() + " Baris ke " + i;
                      row.Cells.Add(cell1);
                      myTable.Rows.Add(row);

                  }
              }
          }
          else
          {
              Response.Write("<script>window.alert('File Belum diupload')</script>");
          }
      }