private void R2NextB_Click(object sender, System.EventArgs e)
 {
     if (AddTB.Text != "")
     {
         if (SC.Step3(AddTB.Text, double.Parse(LatTB.Text), double.Parse(LngTB.Text)))
         {
             Registration1.Visible = false;
             Registration3.Visible = false;
             Registration2.Visible = false;
             Registration4.Visible = true;
         }
     }
 }