public static void Priview(System.Web.UI.Page p, string inFilePath, string outDirPath = "")
{
Microsoft.Office.Interop.Excel.Application excel = null;
Microsoft.Office.Interop.Excel.Workbook xls = null;
excel = new Microsoft.Office.Interop.Excel.Application();
object missing = Type.Missing;
object trueObject = true;
excel.Visible = false;
excel.DisplayAlerts = false;
string randomName = DateTime.Now.Ticks.ToString(); //output fileName
xls = excel.Workbooks.Open(inFilePath, missing, trueObject, missing,
missing, missing, missing, missing, missing, missing, missing, missing,
missing, missing, missing);
//Save Excel to Html
object format = Microsoft.Office.Interop.Excel.XlFileFormat.xlHtml;
Workbook wsCurrent = xls;//(Workbook)wsEnumerator.Current;
String outputFile = outDirPath + randomName + ".html";
wsCurrent.SaveAs(outputFile, format, missing, missing, missing,
missing, XlSaveAsAccessMode.xlNoChange, missing,
missing, missing, missing, missing);
excel.Quit();
//Open generated Html
Process process = new Process();
process.StartInfo.UseShellExecute = true;
process.StartInfo.FileName = outputFile;
process.Start();
}