/// <summary>
/// A method that supports the subsystem to invite volunteers to the parish. Invokes the SendInvitation method.
/// Parameters that are entered by the user are the subject and contents of the invitation,
/// then are sent as parameters of the SendIvitation method
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Send_Invitation(object sender, EventArgs e)
{
db = new SQLDatabase();
db.Connect();
if (Request.QueryString["id_u"] != null)
{
id_user = int.Parse(Request.QueryString["id_u"]);
}
if (Request.QueryString["id_e"] != null)
{
id_event = int.Parse(Request.QueryString["id_e"]);
}
db.SendInvitation(id_event, db.getId((string)Session["id"]), id_user, title.Value, content.Value);
db.Disconnect();
}