showing null values in Server.Transfer

HI,
when am using Server.Transfer in pasg1.aspx Button1_Click
string val = TextBox1.Text; string val1 = TextBox2.Text;
HttpContext _context = HttpContext.Current;
_context.Items.Add("val", val); _context.Items.Add("val1", val1);
Server.Transfer("page2.aspx");
in page2.aspx page load values r coming HttpContext _context = HttpContext.Current;HiddenField hd = new HiddenField();
HiddenField hd1 = new HiddenField();
if (!IsPostBack)
{
Response.Write(hf.Value);
if (_context.Items["val"] != null)
{
hd.Value = _context.Items["val"].ToString();
}
if (_context.Items["val1"] != null)
{
hd1.Value = _context.Items["val1"].ToString();
}

}
in button click values r not coming
Response.Write(hd.Value);
Response.Write(hd1.Value);