public partial class frmInput : Form
    {
        public frmInput()
        {
            InitializeComponent();
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            //Set our variables from our input form
            string firstName = this.tbFirstName.Text;
            string lastName = this.tbLastName.Text;
            string sample = this.tbSample.Text;

            //Create an instance of the output form
            frmOutput frmOut = new frmOutput();

            //We set values through a property
            frmOut.Sample = sample;

            //We set values through a public method
            frmOut.SetDisplayValues(firstName, lastName);
           

            //We show the output form
            frmOut.ShowDialog();
        }
    }


public partial class frmOutput : Form
    {
        private string sample;
        //Getter / Setter for Sample
        public string Sample
        {
            get
            {
                return sample;
            }
            set
            {
                sample = value;

                //Set from property
                this.tbSample.Text = this.sample;
            }
        }

        public frmOutput()
        {
            InitializeComponent();
        }

        public void SetDisplayValues(string firstName, string lastName)
        {
            //Set from method
            this.tbFirstName.Text = firstName;
            this.tbLastName.Text = lastName;
        }
    }