// Добавить родителя ребенка
 public static void AddParent(string Name, string Phone, string Email, int ChildID)
 {
     object[] Parent = new object[3];
     Parent[0] = Name;
     Parent[1] = Phone;
     Parent[2] = Email;
     DBOperations.InsertParent(Parent, ChildID);
 }
        // Импорт информации о новой группе из документа Excel
        public static void ImportGroup(string FilePath, DataGridView GroupInfo, string GroupName)
        {
            // Открыть документ Excel только для чтения
            Excel.Application ExcelApp = new Excel.Application();
            Excel.Workbook    ExcelWb  = ExcelApp.Workbooks.Open(FilePath, Type.Missing, true);
            Excel.Worksheet   ExcelWs1 = (Excel.Worksheet)ExcelWb.Sheets[1];
            Excel.Worksheet   ExcelWs2 = (Excel.Worksheet)ExcelWb.Sheets[2];

            // Получить ID группы для импорта
            int GroupID = DBOperations.GetGroupID(GroupName);
            // Пройти по всем строкам и считать информацию
            int LastRow = ExcelWs1.Cells.Find("*", System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                                              Excel.XlSearchOrder.xlByRows, Excel.XlSearchDirection.xlPrevious, false, System.Reflection.Missing.Value, System.Reflection.Missing.Value).Row;

            for (int i = 2; i <= LastRow; i++)
            {
                object[] NewChild = new object[6];
                NewChild[0] = GroupID;
                // Name
                NewChild[1] = ExcelWs1.Cells[i, 2].Text;
                // Grade
                NewChild[2] = Int32.Parse(ExcelWs1.Cells[i, 3].Text);
                // Birthday
                NewChild[3] = DateTime.Parse(ExcelWs1.Cells[i, 4].Text);
                // Privilege
                NewChild[4] = Convert.ToInt32(ExcelWs1.Cells[i, 5].Value != null);
                // Address
                NewChild[5] = ExcelWs1.Cells[i, 6].Text;
                long ChildID = DBOperations.InsertChild(NewChild);
                if (ExcelWs1.Cells[i, 7].Value != null)
                {
                    int ParentRow = ExcelWs2.Cells[System.Reflection.Missing.Value, 1].Find(ExcelWs1.Cells[i, 7].Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                                                                                            Excel.XlSearchOrder.xlByRows, Excel.XlSearchDirection.xlPrevious, false, System.Reflection.Missing.Value, System.Reflection.Missing.Value).Row;
                    object[] Parent = new object[3];
                    Parent[0] = ExcelWs2.Cells[ParentRow, 2].Value.ToString();
                    Parent[1] = ExcelWs2.Cells[ParentRow, 3].Value.ToString();
                    Parent[2] = ExcelWs2.Cells[ParentRow, 4].Value.ToString();
                    DBOperations.InsertParent(Parent, ChildID);
                }
                if (ExcelWs1.Cells[i, 8].Value != null)
                {
                    int ParentRow = ExcelWs2.Cells[System.Reflection.Missing.Value, 1].Find(ExcelWs1.Cells[i, 7].Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                                                                                            Excel.XlSearchOrder.xlByRows, Excel.XlSearchDirection.xlPrevious, false, System.Reflection.Missing.Value, System.Reflection.Missing.Value).Row;
                    object[] Parent = new object[3];
                    Parent[0] = ExcelWs2.Cells[ParentRow, 2].Value.ToString();
                    Parent[1] = ExcelWs2.Cells[ParentRow, 3].Value.ToString();
                    Parent[2] = ExcelWs2.Cells[ParentRow, 4].Value.ToString();
                    DBOperations.InsertParent(Parent, ChildID);
                }

                ExcelWb.Close();
                ExcelApp.Quit();
            }
        }