private void AddNewStudent(int rowNumber)
{
dataGridStudents["_StudentID", rowNumber].Value =
StudentDAL.AddNewStudent(dataGridStudents["_First_name", rowNumber].Value.ToString(),
dataGridStudents["_Last_name", rowNumber].Value.ToString(),
dataGridStudents["_Patronymic", rowNumber].Value.ToString(),
null,
dataGridStudents["_Email", rowNumber].Value.ToString(),
dataGridStudents["_Password", rowNumber].Value.ToString(),
null,
dataGridStudents["_Grade", rowNumber].EditedFormattedValue.ToString()
);
}