C Sharp :: How To Get Value From One To Another Form And Vice Versa

I have two form in my project 1st form is FORM1 and 2nd form is FORM2.

FORM1 contain 3 textbox,1 button and FORM2 also contain 3 textbox, 1 button. I want to do....

when user fill FORM1 textboex and click button1 then all entries should be shown on FORM2. and vice versa. I used this code its working very good. when i pass value in form2 textboxes its show on form1 textbox. but i want to do, if textbox of form1 is already fill then form2 textboex should also shws form1 textbox value.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;  
namespace punchout {
    public partial class Form1 : Form

[code]......