private DataTable GetDistinctRows(DataTable dtAlredy, DataTable dtGoingToAdd)
    {
        try
        {
            string strOldFoodID = "";
            for (int i = 0; i < dtAlredy.Rows.Count; i++)
            {
                strOldFoodID += dtAlredy.Rows[i]["Food_ID"].ToString() + ',';
            }
            strOldFoodID = strOldFoodID.TrimEnd(',');
            string[] arrOldFoods = strOldFoodID.Split(',');

            for (int index = 0; index < dtGoingToAdd.Rows.Count; index++)
            {
                string newFoodID = dtGoingToAdd.Rows[index]["Food_ID"].ToString();
                if (!arrOldFoods.Contains(newFoodID))
                {
                    DataRow drNewFooRow = dtAlredy.NewRow();
                    drNewFooRow = dtGoingToAdd.Rows[index];
                    dtAlredy.ImportRow(drNewFooRow);
                }
            }
            return dtAlredy;
        }
        catch
        {
            throw;
        }
    }