public void Visit(TextBoxControl control)
 {
     builder.AppendLine($"<span>{control.Caption}</span><input type='text' value='{control.Value}'></input>");
 }
 public void Visit(TextBoxControl control)
 {
     throw new NotImplementedException();
 }
 public void Visit(TextBoxControl control)
 {
     builder.AppendLine($"**{control.Caption}** _{control.Value}_");
 }