Controling Primary Form from Secondary

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Runtime.InteropServices;

using System.Linq;

using System.Text;

using System.Windows.Forms;



namespace color_2_forms

{

    public partial class Form2 : Form

    {

        public Form2()

        {

            InitializeComponent();

            

        }

        

        public void UpdateMe()

        {

            Form1 frm = new Form1();

            

            

                frm.Show();



                int R = trackBar1.Value;

                int G = trackBar2.Value;

                int B = trackBar3.Value;



            frm.BackColor = Color.FromArgb(R,G,B);



            textBox1.Text = " ( " + trackBar1.Value.ToString() + " , " 

                                + trackBar2.Value.ToString() +","

                            + trackBar3 .Value .ToString () + " ) ";

        }



        private void trackBar1_Scroll(object sender, EventArgs e)

        {

            Form1 frm = new Form1();

            UpdateMe();

        }



       private void trackBar2_Scroll(object sender, EventArgs e)

       {

            Form1 frm = new Form1();

            UpdateMe();

       }

       

       private void trackBar3_Scroll(object sender, EventArgs e)

       {

           Form1 frm = new Form1();

            UpdateMe();

       }







        

    }

}