private void Sua()
 {
     try
     {
         if (string.IsNullOrEmpty(dgv_DanhSach.ActiveRow.Cells["MaSV"].Text)) return;
         var frm = new FrmThemsinhvien
         {
             txtmasinhvien = { Text = dgv_DanhSach.ActiveRow.Cells["MaSV"].Text, ReadOnly = true },
             txthotendem = { Text = dgv_DanhSach.ActiveRow.Cells["HoSV"].Text },
             txttensinhvien = { Text = dgv_DanhSach.ActiveRow.Cells["TenSV"].Text },
             cbongaysinh = { Text = dgv_DanhSach.ActiveRow.Cells["NgaySinh"].Text },
         };
         frm.CheckUpdate = true;
         frm.ShowDialog();
         if (frm.CheckUpdate) return;
         dgv_DanhSach.ActiveRow.Cells["HoSV"].Value = frm.txthotendem.Text;
         dgv_DanhSach.ActiveRow.Cells["TenSV"].Value = frm.txttensinhvien.Text;
         dgv_DanhSach.ActiveRow.Cells["NgaySinh"].Value = frm.cbongaysinh.Text;
         dgv_DanhSach.ActiveRow.Cells["MaLop"].Value = frm.cbolop.Text;
         dgv_DanhSach.ActiveRow.Cells["TenKhoa"].Value = frm.cbokhoa.Text;
     }
     catch (Exception ex)
     {
         Log2File.LogExceptionToFile(ex);
     }
 }
 public void Themmoi()
 {
     _frmThemsinhvien = new FrmThemsinhvien();
     _frmThemsinhvien.Themmoisinhvien += Themmoisinhvien;
     _frmThemsinhvien.ShowDialog();
 }