private void Gv_Students_RowClick(object sender, DevExpress.XtraGrid.Views.Grid.RowClickEventArgs e)
        {
            if (e.Clicks != 2)
            {
                return;
            }
            var id = Guid.Parse(Gv_Students.GetFocusedRowCellValue("Id").ToString());

            ShowStudentInfoForm(false, id);
        }
        private void Sb_Update_Click(object sender, EventArgs e)
        {
            var id = Guid.Parse(Gv_Students.GetFocusedRowCellValue("Id").ToString());

            ShowStudentInfoForm(false, id);
        }