public static List <Lesson> GetAllLessons()
{
List <Lesson> output = new List <Lesson>();
DataSet ds = BDManager.SqlQuery("SELECT * FROM Lessons");
foreach (DataTable dt in ds.Tables)
{
foreach (DataRow row in dt.Rows)
{
output.Add(Lesson.parseFromDB(row));
}
}
return(output);
}