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Common functions asp .net static shared library

references custom encryption class here

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.Security;
using System.Text;
using System.Net;
using System.IO;

namespace AIS.Common
    public static class Shared
        //TODO: add local, dev, prd
        public static string basehref { get { return HttpContext.Current.Request.ApplicationPath; } }

        //TODO: change to json serialized object reference to prevent manipulation of pipe delimeters
        public static string SetSecureQueryString(object o)
            string ct = Crypto.Rijndael.Encrypt(o.ToString(), "static_or_dynamic_string");
            return HttpUtility.UrlEncode(ct);

        //TODO: change to json (same as above)
        public static string SetSecureQueryString(object a, object b, object c, object d, object e, object f, object g, object h)
            string ct = Crypto.Rijndael.Encrypt(a.ToString() + "|" + b.ToString() + "|" + c.ToString() + "|" + d.ToString() + "|" + e.ToString() + "|" + f.ToString() + "|" + g.ToString() + "|" + h.ToString(), "livestream");
            return HttpUtility.UrlEncode(ct);

        public static string GetSecureQueryString(string q)
                //automatically decodes querystring in request
                return Crypto.Rijndael.Decrypt(q, "static_or_dynamic_string");
            catch (Exception ex)
                return "";

//retrieves content from web url and returns as string
        public static string DownloadString(string url, NetworkCredential nc=null)
            System.Net.WebClient wc = new WebClient();
            if (nc != null)
                wc.UseDefaultCredentials = true;
                wc.Credentials = nc;

            return wc.DownloadString(url);

//same as above function, different approach with more detail
        public static string DownloadPage(string url)

            const int bufSizeMax = 65536; // max read buffer size conserves memory
            const int bufSizeMin = 8192; // min size prevents numerous small reads
            StringBuilder sb;

            // A WebException is thrown if HTTP request fails

                // Create an HttpWebRequest using WebRequest.Create (see .NET docs)!
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

                request.Method = WebRequestMethods.Http.Get;

                // Execute the request and obtain the response stream
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                Stream responseStream = response.GetResponseStream();

                // Content-Length header is not trustable, but makes a good hint.
                // Responses longer than int size will throw an exception here!
                int length = (int)response.ContentLength;

                // Use Content-Length if between bufSizeMax and bufSizeMin
                int bufSize = bufSizeMin;
                if (length > bufSize)
                    bufSize = length > bufSizeMax ? bufSizeMax : length;

                // Allocate buffer and StringBuilder for reading response
                byte[] buf = new byte[bufSize];
                sb = new StringBuilder(bufSize);

                // Read response stream until end
                while ((length = responseStream.Read(buf, 0, buf.Length)) != 0)
                    sb.Append(Encoding.UTF8.GetString(buf, 0, length));

                return sb.ToString();

            catch (Exception ex)
                sb = new StringBuilder(ex.Message);
                return sb.ToString();


//one approach using filesystem. will only work depending on permissions otherwise url parsing is needed
        public static string GetCurrentPageName()
            string spath = System.Web.HttpContext.Current.Request.Url.AbsolutePath;
            System.IO.FileInfo oInfo = new System.IO.FileInfo(spath);
            string spagename = oInfo.Name;
            return spagename;

//get titlecase string
        public static string GetTitleCase(object str)
                return System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(str.ToString().ToLower());
            catch (Exception ex)
                return "Other";

        #region handleerror
        public static void HandleError(Exception ex)

        //TODO: send error to error handler
        public static void HandleError(string details)

        public static void HandleError(Page p, Exception ex)
            HandleError(p, ex.ToString());

        public static void HandleError(Page p, string details)
            //MessageBox.Show(hwnd, details);

        //TODO: replace with call to error manager or hook to event for compatibility
        public static void SendEmail(string details)  {
        //throw new HttpUnhandledException(details);
            if (Shared.GetCurrentPageName().Replace("/", "") != "error.aspx") //TODO: remove. temporary resolution for unhandled session timeouts. PROTOTYPE
                //TODO: global error log and local

ubuntu lts 12 xrdp rdp setup on Amazon Cloud AWS(12.04.3 precise pangolin)

Consolidated from multiple sources to exclude erroneous steps.

Tested on Amazon Web Services fresh Ubuntu LTS 12.04.3 instance.

Decided upon ubuntu vs centOS simply to avoid having to compile xrdp and manage dependencies manually. Chose 3rd party linux over Amazon AMI in this case for benefit of included repos, use cases and support in their respective communities (ubuntuforums, etc), as well as not having to compile xrdp in Amazon AMI.

sudo useradd -m {name}
passwd {name}

#you may want to consider setting a root passwd in case you mess up sudoers. if you make a mistake with sudoers terminate your instance and relaunch 🙂 ... or you could mount the HD with another system if it's unencrypted and modify sudoers
passwd root

#edit /etc/sudoers.d and add your new user
{name} ALL=(ALL) ALL

#edit sshd /etc/ssh/sshd_config disable root login and allow password authentication (if you like)
service ssh restart

sudo apt-get install xrdp

sudo apt-get install gnome-session-fallback

#two options, 2d unity no longer available, previously
echo "gnome-session --session=ubuntu-2d" > ~/.xsession
echo gnome-session --session=gnome-fallback > ~/.xsession

#make sure your user has permission to this file if you have to create it with sudo etc
chown {name}:{name} .xsession

sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get install gnome-shell

sudo apt-get install lightdm

sudo /usr/lib/lightdm/lightdm-set-defaults -s gnome-fallback

Don’t forget AWS Firewall:

22 (SSH)	your ip/32

MySQL Quick Reference

Import CSV:

LOAD DATA LOCAL INFILE '/filename.csv'
INTO TABLE test_table
(field1, filed2, field3);


Quick Cisco IOS Reference

As a general word of caution, if you have no experience with Cisco or other CLI based router admin (such as linux and red hat derivatives), I would not recommend diving in unless you have a lot of spare time on your hands in the event that you accidentally delete all routing tables or cause other serious problems!

Even in a professional business environment, due to some differences between IOS and hardware versions and the need to reboot for some settings to take effect, it’s always a good idea to perform changes after hours when critical business operations will not be interrupted by internet or service downtime.

Official Cisco IOS Manual,

Manipulate NAT and other general help references and top hits on Google for common Cisco beginner questions:

PHP Quick Reference

Escape sequences for print output:

\" - double quote
\' - single quote
\n - new line
\t - tab
\r - carriage return
\$ - dollar sign
\\ - backslash

Max integer and float size (overflow):

//on a 32-bit system
$large_number = 2147483647;
var_dump($large_number);                     // int(2147483647)

$large_number = 2147483648;
var_dump($large_number);                     // float(2147483648)

$million = 1000000;
$large_number =  50000 * $million;
var_dump($large_number);                     // float(50000000000)

//on a 64-bit system
$large_number = 9223372036854775807;
var_dump($large_number);                     // int(9223372036854775807)

$large_number = 9223372036854775808;
var_dump($large_number);                     // float(9.2233720368548E+18)

$million = 1000000;
$large_number =  50000000000000 * $million;
var_dump($large_number);                     // float(5.0E+19)

generate random number:

echo rand() . "\n";
echo rand() . "\n";

echo rand(5, 15);

Get Current Page Name:

function curPageName() {
 return substr($_SERVER["SCRIPT_NAME"],strrpos($_SERVER["SCRIPT_NAME"],"/")+1);

Came across the following on stackoverflow while looking for the PHP equivalent of string.format.

Sprintf (similar to php printf, in c# string.format):

$filter = "content:%1$s title:%1$s^4.0 path.title:%1$s^4.0 description:%1$s ...";
$filter = sprintf($filter, "Cheese");


function format() {
    $args = func_get_args();
    if (count($args) == 0) {
    if (count($args) == 1) {
        return $args[0];
    $str = array_shift($args);
    $str = preg_replace_callback('/\\{(0|[1-9]\\d*)\\}/', create_function('$match', '$args = '.var_export($args, true).'; return isset($args[$match[1]]) ? $args[$match[1]] : $match[0];'), $str);
    return $str;

StackOverflow, “C# String.Format() Equivalent in PHP?”,