Gridview inside Gridview in ASP.NET C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;

/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
	public Class1()
	{
		//
		// TODO: Add constructor logic here
		//
	}
    public static DataSet fillDataset(string sql)
    {
        SqlConnection Scon = new SqlConnection(ConfigurationManager.ConnectionStrings["CS"].ToString());
        SqlCommand Scmd = new SqlCommand(sql, Scon);
        Scmd.CommandType = CommandType.Text;
        SqlDataAdapter adp = new SqlDataAdapter(Scmd);
        DataSet ds = new DataSet();
        try
        {
            if (Scon.State == ConnectionState.Closed)
            {
                Scon.Open();
                adp.Fill(ds);

            }
        }
        catch
        {
        }
        finally
        {
            adp.Dispose();
            if (Scon.State == ConnectionState.Open)
            {
                Scon.Close();
            }
        }
        
        return ds;
    }
    public static int nonquery(string sql)
    {
        SqlConnection Scon = new SqlConnection(ConfigurationManager.ConnectionStrings["CS"].ToString());
        SqlCommand Scmd = new SqlCommand(sql, Scon);
        Scmd.CommandType = CommandType.Text;

        int rowsaffected = 0;
        try
        {
            if (Scon.State == ConnectionState.Closed)
            {
                Scon.Open();

                rowsaffected = Scmd.ExecuteNonQuery();
            }
        }
        catch
        {
        }
        finally
        {
        }
        return rowsaffected;
    }

    public static int nonquery1(string Id, string name)
    {
        SqlConnection Scon = new SqlConnection(ConfigurationManager.ConnectionStrings["CS"].ToString());
        SqlCommand Scmd = new SqlCommand("spUpdate", Scon);
        Scmd.CommandType = CommandType.StoredProcedure;
        Scmd.Parameters.Add("@FName", SqlDbType.VarChar).Value = name;
        Scmd.Parameters.Add("@ID", SqlDbType.BigInt).Value = long.Parse(Id);
        int rowsaffected = 0;
        try
        {
            if (Scon.State == ConnectionState.Closed)
            {
                Scon.Open();

                rowsaffected = Scmd.ExecuteNonQuery();
            }
        }
        catch
        {
        }
        finally
        {
        }
        return rowsaffected;
    }
}