The best overload method match for 'system.convert.todouble' has some invalid arguments

Question

hi here is my code my error is mentioned in the title can anyone help how to resolve iam defing in the code where the error is getting

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 System.Data.SqlClient;
using System.Configuration;

namespace center
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        SqlConnection cn= new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());


       
        SqlDataAdapter da = null;
        SqlCommand cmd = null;
        DataSet ds = null;
        DataSet ds1 = null;
        
        
        protected void Page_Load(object sender, EventArgs e)
        {
            DataSet dd1 = get();
            DataSet dd2 = get1();
            
            g1.DataSource = ds.Tables[0];
            g1.DataSource = ds1.Tables[0];
            g1.DataBind();
            for (int i = 0; i < dd2.Tables[0].Rows.Count; i++)
            {
                for (int j = 0; j < dd1.Tables[0].Rows.Count; j++)
                {
                    //if ((dd1.Tables[0].Rows[i]["X"] == dd2.Tables[0].Rows[i]["X"]) && (dd1.Tables[0].Rows[i]["Y"] == dd2.Tables[0].Rows[i]["Y"]) &&
                    //    (dd1.Tables[0].Rows[i]["W"] == dd2.Tables[0].Rows[i]["W"]) && (dd1.Tables[0].Rows[i]["H"] == dd2.Tables[0].Rows[i]["H"]))
                    //{
                    //    string PageName = dd1.Tables[0].Rows[i]["PageNumber"].ToString();
                    //}
                    if (Convert.ToDouble(dd2.Tables[0].Rows[i]["X"].ToString()) == Convert.ToDouble(dd1.Tables[0].Rows[j]["X"].ToString()) && Convert.ToDouble(dd2.Tables[0].Rows[i]["Y"].ToString()) == Convert.ToDouble(dd1.Tables[0].Rows[j]["Y"].ToString()) &&
                        Convert.ToDouble(dd2.Tables[0].Rows[i]["W"].ToString()) == Convert.ToDouble(dd1.Tables[0].Rows[j]["W"].ToString()) && Convert.ToDouble(dd2.Tables[0].Rows[i]["H"].ToString()) == Convert.ToDouble(dd1.Tables[0].Rows[j]["H"].ToString()))
                    {
                        string PageName = dd2.Tables[0].Rows[i]["ADVERTISEMENTID"].ToString();
                        get2(Convert.ToDouble(dd2.Tables[0].Rows[i]["X"], Convert.ToDouble(dd2.Tables[0].Rows[i]["Y"], Convert.ToDouble(dd2.Tables[0].Rows[i]["W"], Convert.ToDouble(dd2.Tables[0].Rows[i]["H"]); // ERROR IS THE TITLE
                    }
                }
            }
        }
        public DataSet get()
        {
            string str = "select * from tbl_Manifest";
            cn.Open();
            SqlCommand cmd = new SqlCommand(str, cn);
            da = new SqlDataAdapter(cmd);
            ds = new DataSet();
            da.Fill(ds);
            cn.Close();
            return ds;
        }
        public DataSet get1()
        {
            string str1 = "select * from tbl_Advertisement";           
            cn.Open();
            SqlCommand cmd = new SqlCommand(str1, cn);
            da = new SqlDataAdapter(cmd);
            ds1 = new DataSet();
            da.Fill(ds1);
            cn.Close();
            return ds1;
        }
        public void get2(double X, double Y, double W, double H)
        {
            string str2 = "update tbl_Manifest set ADVERTISEMENTID = ADVERTISEMENTID WHERE X='"+X+"' AND Y='"+Y+"' AND W='"+W+"' AND H='"+H+"'";
            cn.Open();
            SqlCommand cmd = new SqlCommand(str2, cn);
           // var param = new SqlParameter("ADVERTISEMENTID", SqlDbType.VarChar);
            cmd.CommandType = CommandType.Text;
            cmd.ExecuteNonQuery();
            cn.Close();
            
        }
    }
}