Tag Archives: c#

Active Directory via C#

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There is a requirement to perform CRUD operation on an Active Directory and we need to create it on C#. The following code will help an engineer accordingly:

Create

using (DirectoryEntry directoryEntry = new DirectoryEntry("LDAP:\\url\ou", "username", "password"))
                {
                    using (DirectoryEntry newUser = directoryEntry.Children.Add("CN=Name", "User"))
                    {
                        if (!DirectoryEntry.Exists(newUser.Path))
                        {
                            newUser.Properties["property1"].Add(propertyValue);
                            newUser.CommitChanges();
                            ret = true;
                        }
                    }
                }

Update

using (DirectoryEntry directoryEntry = new DirectoryEntry("LDAP:\\url\ou", "username", "password"))
                {
                    using (DirectorySearcher search = new DirectorySearcher(directoryEntry))
                    {
                        search.Filter = String.Format("(IdentifierProperty={0})", identifier);
                        search.PropertiesToLoad.Add("property1");
                        SearchResult result = search.FindOne();
                        if (result != null)
                        {
                            using (DirectoryEntry entryToUpdate = result.GetDirectoryEntry())
                            {
                                entryToUpdate.Properties["property1"].Value = "property1value";
                                entryToUpdate.CommitChanges();
                                ret = true;
                            }
                        }
                    }
                }

Delete

using (DirectoryEntry directoryEntry = new DirectoryEntry("LDAP:\\url\ou", "username", "password"))
                {
                    using (DirectorySearcher search = new DirectorySearcher(directoryEntry))
                    {
                        search.Filter = String.Format("(IdentifierProperty={0})", identifier);
                        search.PropertiesToLoad.Add("property1");
                        SearchResult result = search.FindOne();
                        if (result != null)
                        {
                            using (DirectoryEntry entryToUpdate = result.GetDirectoryEntry())
                            {
                                directoryEntry.Children.Remove(entryToUpdate);
                                directoryEntry.CommitChanges();
                                ret = true;
                            }
                        }
                    }
                }

Dynamic Object in C#

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In my experience there was a need to create an object and its properties dynamically. Namely as follows:

thisIsMyObject.MyProperty1 = "AnyValueOfAnyType";
thisIsMyObject.MyProperty2 = true;
thisIsMyObject.MyProperty3 = 1;

To do this there could be different approaches like using a dictionary

Dictionary<string,object> c = new Dictionary<string,object>();
//adding a value
c.Add("MyProperty1", "AnyValueOfAnyType");
c.Add("MyProperty2", true);
c.Add("MyProperty3", 1);
//getting the value
c["MyProperty1"]; //AnyValueOfAnyType
c["MyProperty2"]; //true
c["MyProperty3"]; //1

But you may also use a dynamic object like as follows

var c = new System.Dynamic.ExpandoObject() as IDictionary<string, Object>; //namespace for note only
//adding a value
c["MyProperty1"] = "AnyValueOfAnyType";
c["MyProperty2"] = true;
c["MyProperty3"] = 1;
//getting the value
c["MyProperty1"]; //AnyValueOfAnyType
c["MyProperty2"]; //true
c["MyProperty3"]; //1

This way its more presentable and like using an array.

God Bless!

Thanks,
Thomie

DateTime not parsing MM/dd/yyyy correctly on Windows 10 on ASP .Net MVC

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Have you experienced coding and all of a sudden when on windows 10 you experienced that MM/dd/yyyy is not a valid date? This is because of the culture that is default implemented on your device, in this case on my device with Windows 10 Pro. To cause of this is the machine is by default is using dd/MM/yyyy and in this case apps that we are developing is having this kind of issue.

Thank fully the fastest way to fix is via the web.config with the following code:

<system.web>

<globalization culture=”en-US” uiCulture=”en-US”/>

 

And then run again your application and it will now accept your MM/dd/yyyy.

Replace words on MS Word using C#

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Hi,

Recently I was instructed to create an application that will be able to replace an array of words and replace them with an array of corresponding words on an MS Word document. With this I’ve searched the following:

Prerequisites

  1. Visual Stduio
  2. Install the nuget package DocX
  3. Administrative access on the context the application is running

Code

Dictionary<string, string> lReplacements = new Dictionary<string, string>();
string newFullPath = @”c:\sample.docx”;

using (DocX document = DocX.Load(newFullPath))
{

//for loop is better than foreach
foreach (var item in lReplacements)
{

document.ReplaceText(item.Key, item.Value);

}
document.Save();

}

Hope it helped you as it helped me with this simple snippet.

God Bless!
Thanks,
Thomie

C# Task<object> return Type

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In every signalr or webapi request based application there is a need to indicate the return type of Task<object> along with the async keyword. Let say this sample:

public async Task<MyObject> GetItem(){

MyObject myObject = new MyObject();

myObject = await getSomeWhereThere();

#doSomethingElse

return myObject;

}

In this sample, we all know that this is a asynchronous request from somewhere. Which dictates that myObject will return later after the getSomeWhereThere(); has finished executing. But we need to remind of a very important thing that #doSomethingElse will not be executed in Xamarin if it is not properly used. Let say we did this instead:

public async void GetItem(){

MyObject myObject = new MyObject();

myObject = await getSomeWhereThere();

#doSomethingElse

}

In this code the #doSomethingElse will not be executed because it will only assume that after the getSomeWhereThere(); is executed you don’t mind if #doSomethingElse is still needed. Thus make sure that we use the Task<MyObject> in cases like this so that #doSomethingElse will still be executed.

Convert.ToDateTime Regardless of Culture

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Did you upgrade to Windows 10 recently and your MVC website now have an issue under the development phase after it? Then maybe you also experience the same issue that affected your code on IIS. That is becuase Convert.ToDateTime utilizes the machine’s Culture(It changes when you use Windows 10 even you are using the same Country set) to parse a Date time. So to use it regardless of the Culture use the code snippet below.

 

string s = “20.09.2015 10.16.12”;
string expextedFormat = “dd.MM.yyyy HH.mm.ss”;
DateTime d;
bool isValid = DateTime.TryParseExact(s, expextedFormat , CultureInfo.InvariantCulture, DateTimeStyles.None, out d);

 

Hope it helped you as it helped me.

ELMAH – Error Logging Modules and Handlers

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What is ELMAH?

  • ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment.
  • Once ELMAH has been dropped into a running web application and configured appropriately, you get the following facilities without changing a single line of your code:
    • Logging of nearly all unhandled exceptions.
    • A web page to remotely view the entire log of recoded exceptions.
    • A web page to remotely view the full details of any one logged exception, including colored stack traces.
    • In many cases, you can review the original yellow screen of death that ASP.NET generated for a given exception, even with customErrors mode turned off.
    • An e-mail notification of each error at the time it occurs.
    • An RSS feed of the last 15 errors from the log.

How to Install ELMAH on your MVC Project?

  • Open Nuget Package Manager on the MVC Project
  • Search for ELMAH and Install it.
  • Then configure it.

ELMAH Configuration

  • It will already add some configuration under your web.config but we need to include some configuration so that it will point to a database.

  • <connectionStrings>

  <add name=”elmahConnectionString” connectionString=”Data Source=Server;Initial Catalog=ELMAH_DEV;uid=user;pwd=user;Pooling=true;Min Pool Size=0;Max Pool Size=999;” providerName=”System.Data.SqlClient” />

</connectionStrings>

  • <elmah>

    <!–

See http://code.google.com/p/elmah/wiki/SecuringErrorLogPages for

more information on remote access and securing ELMAH.

–>

<security allowRemoteAccess=”true” />

<errorLog type=”Elmah.SqlErrorLog, Elmah” applicationName=”NameOfApplication_DEV” connectionStringName=”elmahConnectionString” />

</elmah>

  • We also need to remove some sections that we don’t need specially the section below that automatically create a page for the logs.

  • <location path=”elmah.axd” inheritInChildApplications=”false”>…</location>

Logging

  • All uncatched exception will automatically be recorded.
  • All exception handling will NOT be recorded automatically. It needs to be manually logged by including the Elmah.ErrorSignal.FromCurrentContext().Raise(ex);

try{
throw new Exception(“Some Exception”);
}catch(Exception ex){

Elmah.ErrorSignal.FromCurrentContext().Raise(ex);
}

 

Signalr – OnDisconnect(bool stopCalled)

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Most of us who are using .Net as our Programming language use Signalr as our Real-Time Framework. And we implement OnDisconnect in most cases to catch clients that have been disconnected. Since then there were no parameter included as an Overload of the said method. Lately on the latest releases by the Signalr team they have included an Overload so that we can distinguish what triggers the disconnection and help us manage our Apps behavior to it.

With this said I have one experience that I want to share as this may also frustrate some people who are counting connected users and having a problem that when their app have multi workers (Web Garden) they app somehow always trigger OnDisconnect even if the user is still connect. So I want to share this findings on how to properly address it.

  1. Make sure that the App is using a Backplane to manage connection on your hub so that the connections are shared on all threads/servers. I use SQLServer.
  2. Make sure to use the Database on counting your list of connection and tagging who is who. Because in memory List even its static will not be shared on a different server (obviously).
  3. Make sure to trigger disconnection action when the OnDisconnect is called with the stopCalled is equal to true.

Let me highlight what is stopCalled is equal to true means.

  1. It returns true if the method on the connection to close is trigger
  2. It returns true if the browser is called
  3. It returns false if the timeout has been met

Hope this instructions will help you manage your site as it help me on our projects.

God Bless!

Thanks,
Thomie

TCP and C# Connecting via Lan

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Have you ever thought that you want to connect to create an application that can talk via LAN? Then TCP is one of the mode that you can choose one. Here are the codes from MSDN that can help you:

TCPListen – This is used when you want to create a server like application.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace TCPListen
{
class Program
{
static void Main(string[] args)
{
TcpListener server = null;
try
{
// Set the TcpListener on port 13000.
Int32 port = 13000;
IPAddress localAddr = IPAddress.Parse("127.0.0.1");

// TcpListener server = new TcpListener(port);
server = new TcpListener(localAddr, port);

// Start listening for client requests.
server.Start();

// Buffer for reading data
Byte[] bytes = new Byte[256];
String data = null;

// Enter the listening loop.
while (true)
{
Console.Write("Waiting for a connection... ");

// Perform a blocking call to accept requests.
// You could also user server.AcceptSocket() here.
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Connected!");

data = null;

// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();

int i;

// Loop to receive all the data sent by the client.
while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
{
// Translate data bytes to a ASCII string.
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
Console.WriteLine("Received: {0}", data);

// Process the data sent by the client.
data = data.ToUpper();

byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);

// Send back a response.
stream.Write(msg, 0, msg.Length);
Console.WriteLine("Sent: {0}", data);
}

// Shutdown and end connection
client.Close();
}
}
catch (SocketException e)
{
Console.WriteLine("SocketException: {0}", e);
}
finally
{
// Stop listening for new clients.
server.Stop();
}

Console.WriteLine("\nHit enter to continue...");
Console.Read();
}
}
}

TCPClient – As the name suggest it will be used to create the client that will connect to our server.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace TCPListen
{
class Program
{
static void Main(string[] args)
{
TcpListener server = null;
try
{
// Set the TcpListener on port 13000.
Int32 port = 13000;
IPAddress localAddr = IPAddress.Parse("127.0.0.1");

// TcpListener server = new TcpListener(port);
server = new TcpListener(localAddr, port);

// Start listening for client requests.
server.Start();

// Buffer for reading data
Byte[] bytes = new Byte[256];
String data = null;

// Enter the listening loop.
while (true)
{
Console.Write("Waiting for a connection... ");

// Perform a blocking call to accept requests.
// You could also user server.AcceptSocket() here.
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Connected!");

data = null;

// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();

int i;

// Loop to receive all the data sent by the client.
while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
{
// Translate data bytes to a ASCII string.
data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
Console.WriteLine("Received: {0}", data);

// Process the data sent by the client.
data = data.ToUpper();

byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);

// Send back a response.
stream.Write(msg, 0, msg.Length);
Console.WriteLine("Sent: {0}", data);
}

// Shutdown and end connection
client.Close();
}
}
catch (SocketException e)
{
Console.WriteLine("SocketException: {0}", e);
}
finally
{
// Stop listening for new clients.
server.Stop();
}

Console.WriteLine("\nHit enter to continue...");
Console.Read();
}
}
}

God Bless!

Thanks,
Thomie

GAME : Typing Mania

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Download: TJSAsTypingMania

TJSAsTypingMania

TJSAsTypingMania

This is another game that during my OJT I have experimented on the .Net Framework during our free time.

The goal of the game is to type the letters that will be shown to you in the shortest possible time.

GAME : MouseAttack v1.0

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Download: TJSAsMouseAttack

During my OJT I have experimented on the .Net Framework to develop some games during our free time.

One the games I have develop is the MouseAttack. Its a game were you need to avoid some falling objects in order to get more points. The game was developed for a little time, but I hope you like it.