Error in redirect url

Hi.I want to redirect to an address. I wrote thiscode :
Context.Items.Add("RedirectURL","http://www.name.com/callback.aspx");
Context.Items.Add("MID","MerchantID");
Context.Items.Add("ResNum",ResNum.Text);
Context.Items.Add("Amount",Label1.Text);
Server.Transfer("http://213.217.42.116/CardServices/controller");
but I have&nbs ...