App_Code/ExcelPreview.cs

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using Microsoft.Office.Interop.Excel;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for ExcelPreview
/// </summary>
public class ExcelPreview
{
    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();
    }

}