public void Add_Mother(Mother mother1)
 {
     for (int i = 0; i < 7; i++)//check end isnt smaller then begining
     {
         if (mother1.Wanted_Hours[1, i] < mother1.Wanted_Hours[0, i])
         {
             throw new Exception("wrong hours format");
         }
     }
     my_dal.Add_Mother(mother1);
 }