QueryString传值的加密与解密方法 .

//加密
Response.Redirect("DetailInfo.aspx?id=" + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("sp10006")).Replace("+","%2B"));

//解密
string ID = System.Text.Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));