Custom node name in Umbraco Doc2Form

// add this in section for private strings
private string _customNodeName = "";

// add this in public properties
// remember to add CustomNodeName as textstring property to your macro!
public string CustomNodeName
{
    set { _customNodeName = value; }
}

// change this in btnSubmit_Click private function
  if (!_editMode)
    {
    umbraco.cms.businesslogic.CMSNode parent = new umbraco.cms.businesslogic.CMSNode(_nodeId);
    string text = Title.Text;
    if (!_showTitle && text.Length == 0)
    {
            // if we set custom name, use that..
             if (_customNodeName.Length > 0)
            {
              text = _customNodeName;
            }
            else
            {
                try
                {
                  text = "RE: " + parent.Text;
                }
                catch
                {
                  text = "Created by Doc2Form on " + DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString();
                }
            }
  }