<input id="filePathHidden" runat="server"  type="hidden" />
        <asp:FileUpload ID="FileUpload1" runat="server" />
   
        <asp:Button ID="Button1" runat="server"
            Text="Button" onclick="Button1_Click" />
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using Aspose.Cells;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string path = Server.MapPath(FileUpload1.FileName);
        Workbook workbook = new Workbook();      
        workbook.Open(FileUpload1.PostedFile.InputStream);
        //Get the first worksheet cells collection
        Cells cells = workbook.Worksheets[0].Cells;

        for (int i = 1; i < cells.MaxDataRow; i++)
        {
            for (int j = 0; j < cells.MaxDataColumn; j++)
            {
                Response.Write(cells[i, j].StringValue);

            }
        }
        System.Data.DataTable dt = new DataTable();
     
        dt = cells.ExportDataTable(1, 0, cells.MaxDataRow + 1, cells.MaxDataColumn + 1);
        dt.Columns[0].ColumnName = "Question";
        dt.Columns[1].ColumnName = "Choice1";
        dt.Columns[2].ColumnName = "Choice2";
        dt.Columns[3].ColumnName = "Choice3";
        dt.Columns[4].ColumnName = "Choice4";
        dt.Columns[5].ColumnName = "Answer";
        dt.AcceptChanges();
        GridView1.DataSource = dt;
        GridView1.DataBind();
     
    }
}