How to add new panel to a form after threading?

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C#

i am using threading method in generating the sql command
to prevent my main application getting freeze
but when i try to add a new panel after sucessfully connected with the server
but i triggered an error :
cross-thread operation not valid..

i read several article from google a lot of people said that it is not a best way to add any user control with using threading

so i tried another method
1st abort my thread as u can see at openConnection, LoadConnection.Abort(); is commend.
after i abort it i tried this method

if (loadConnection.IsAlive) {  }
            else{
                
                if (connectionStatus == "connectionSucceed") { }
                else if (connectionStatus == "connectionFail") {
                    var panel = new Panel(){ new size(100,100), location (0,0);}
                }
            }

but this time nothing happen.

is there any way to add any user control to the main form while running the sql command without freezing the UI??

What I have tried:

using System.Threading;
using MySql.Data.MySqlClient;

namespace databaseCommand{
    public static class mainCommand {
        private static Thread loadConnection = new Thread(new ThreadStart(openConnection));
        private static MySqlConnection con;
        private static string connectionStatus;

        public static void startConnection() {
            loadConnection.Start();
        }

        private static void openConnection() {
            con = new MySqlConnection("server=localhost;user=root;database=bookbardatabase;port=3306;password=");
            try{
                con.Open();
                //connectionStatus = "connectionSucceed";
                //conStatus = "Connected to server";
            }
            catch (Exception ex){
                //connectionStatus = "connectionFail";
                //conStatus = ex.ToString();
                var panel = new Panel(){ new size(100,100), location (0,0);}
            }
            //loadConnection.Abort();
        }
    }
}