gridview2 under form tag

i am using master page with form tag runat server

but on my dedicated page to master page, i am using two gridviews to get data by corresponding click from grid1 and get value in grid2.

i am using itextsharp for save file in pdf from grid2.

the problem is when i run the command on browser

it shows error that is gridview2 should be under form tag. that i already given in the master page. how would i get the optimal solution for this.

what i have treied as follows:-

HERE IS MY CS CODE:-

enter code here

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.Configuration;

using System.Data;

using System.Data.SqlClient;

using iTextSharp.text;

using iTextSharp.text.html.simpleparser;

using iTextSharp.text.pdf;

using System.IO;

using System.Text;

public partial class list : System.Web.UI.Page

{

SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["ledgerConnection"].ConnectionString);

SqlCommand cmd = new SqlCommand();

DataSet ds = new DataSet();

SqlDataAdapter sda = new SqlDataAdapter();

protected void Page_Load(object sender, EventArgs e)

{

//userLabel.Text = "" + "" + "" + Session["user"] + "";