private void btn1_Click(object sender, RoutedEventArgs e)
{
    DateTime date = Convert.ToDateTime(lbl_date1.Content);

    Vazhipadu_receipt obj = new Vazhipadu_receipt(date);
    obj.ShowDialog();
    //this.Close();

}

public Vazhipadu_receipt(DateTime date)
{
    //DateTime date_v = date;
    //string day = date_v.ToString("dd");

    //txt_mnth_v.Text = date.ToString("MM");
    //txt_year_v.Text = date.ToString("yyyy");
    InitializeComponent();
    //window_load();
    load();
    txt_day_v.Text = date.ToString("dd");
    txt_mnth_v.Text = date.ToString("MM");
    txt_year_v.Text = date.ToString("yyyy");
   // this.sessionNow = sessionNow;
}