C#

public class frmEziLife : System.Windows.Forms.Form
{
    // NewEziForm;
    frmEziLife_New NewEziForm = new frmEziLife_New();
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    public void yahaa()
    {
        this.Text = "TEST";
        this.lblName.Text = "TEST";
        lblName.Refresh();
        MessageBox.Show("Yahaa!!", "STOP!!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        this.lblName.Text = "TEST";
    }


    private void mnuNew_Click(object sender, System.EventArgs e)
    {
        NewEziForm.myParentForm = this;
        NewEziForm.ShowDialog();
    }
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}

public class frmEziLife_New : System.Windows.Forms.Form
{
    // Database;
    VistaDBDatabase eziDatabase = new VistaDBDatabase();
    VistaDBTable proposalTable = new VistaDBTable();

    Form myParentForm;
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    EziLifeForm.new_record_id = proposalTable.GetInt32("EZI_ID");
    myParentForm.yahaa();
    this.Close();
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}

public class frmEziLife_New : System.Windows.Forms.Form
{
    // Database;
    VistaDBDatabase eziDatabase = new VistaDBDatabase();
    VistaDBTable proposalTable = new VistaDBTable();
    frmEziLife myParentForm;
}