protected void btnAdd_Click(object sender, EventArgs e)
{
SinhVien.ST_Insert(txtMaSV.Text, txtHoTen.Text, txtLop.Text, txtGioiTinh.Text, txtNgaySinh.Text, txtEmail.Text);
SinhVien.ST_InsertAcc(txtMaSV.Text);
Response.Redirect("AccStManagement.aspx");
Response.Write("<script>alert('Thêm Thành Công')</script>");
}