public static void Attend(ParticipationClass At)
{
Conn.Open();
string query = String.Format("Insert into [dbo].[Participations](User_Id,Training_Id) values({0},{1})", At.GetUserId(), At.GetTrainingId());
command = new SqlCommand(query, Conn);
command.ExecuteNonQuery();
Conn.Close();
}
public static void LeaveTraining(ParticipationClass Pc)
{
Conn.Open();
string query = String.Format("Delete from [dbo].[Participations] where User_Id={0} and Training_Id={1}",Pc.GetUserId(),Pc.GetTrainingId());
command = new SqlCommand(query, Conn);
command.ExecuteNonQuery();
Conn.Close();
}