private void BtnFormSpecialityAdd_Click(object sender, EventArgs e)
        {
            if (Program.CurrentUser.IsStudent || Program.CurrentUser.IsLecture)
            {
                MessageBox.Show("Нямате права за добавяне на специалности!", "Предупреждение", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }
            FormАddSpecialities sp = new FormАddSpecialities();

            sp.ShowDialog();
        }
        private void DataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex < 0)
            {
                return;
            }
            var st = (dgSpecialities.Rows[e.RowIndex].DataBoundItem as TSpeciality);

            if (e.ColumnIndex == Column1.Index)
            {
                return;
            }

            FormАddSpecialities sc = new FormАddSpecialities();

            sc.speciality = st;
            sc.ShowDialog();
        }