/// <summary>
/// The method responsible for handling the subsystem of adding events. Retrieves information from the form entered by the user.
/// Then it calls the InsertEvents method to send the downloaded values as method parameters.
/// The event can also be created on the basis of the announcement, the method checks if the announcement number is sent using QueryString.
/// If so, the value of the advertisement number is sent. If number -1 is not sent.
/// In the InsertEvents method there is further support for the value of the advertisement number.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Add_Event(object sender, EventArgs e)
{
SQLDatabase db = new SQLDatabase();
int id_a = -1;;
if (Request.QueryString["id_a"] != null)
{
id_a = int.Parse(Request.QueryString["id_a"]);
}
db.Connect();
db.InstertEvents(id_a, db.getId((string)Session["id"]), due_date.Value, title.Value, content.Value);
db.Disconnect();
Response.Redirect("Events.aspx");
}