protected void Button1_Click(object sender, EventArgs e)
    {
        strPath = Server.MapPath(@"~/updata/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls"); 
            
        File1.PostedFile.SaveAs(strPath);
        string mystring = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = '" + strPath + "';Extended Properties=Excel 8.0";
        OleDbConnection cnnxls = new OleDbConnection(mystring);
        OleDbDataAdapter myDa = new OleDbDataAdapter("select * from [Sheet1$]", cnnxls);
        DataSet myDs = new DataSet();
        myDa.Fill(myDs);
        GridView2.DataSource = myDs.Tables[0];
        GridView2.DataBind();

    }