.NET App Developer Notes

Last couple of weeks I have been busy trying out my new project in VS2010 / C#. Couple of basic exercises for my learning purpose are listed below. Please modify the code to make it work.

Tip #1

• Working on Folder Open and Browse Dialog for a Windows FormsApp
• Best option is to reuse codeplex code. Link 

Tip #2

• Working with Threads
• Below is a Simple Threadpool (For sum of two numbers). Try it out as a Forms app so see how operations are performed parallely.

using System;
using System.Threading;
using System.Windows.Forms;
class InputNumbers
{
    public int a { get; set; }
     public int b { get; set; }
}
class Example
{
    public Example()
    {
      // Declare a new argument object.
      InputNumbers IS = new InputNumbers();
      IS.a = 10;
      IS.b = 20;
      for(int i = 0; i<100 ; i++)
      {
            IS.a = i;
            IS.b = i+2;
            // Send the custom object to the threaded method.
            ThreadPool.QueueUserWorkItem(new WaitCallback(AddNumbers), InputNumbers);
    }

    private void AddNumbers(object a)

    {
      InputNumbers IS = a as InputNumbers;
      Messagebox.show((IS.a+IS.b).ToString());
    }
}

Tip #3

To keep methods seperate, DB Layer, Web Methods and UI Layer, I decided to keep them in different classes. This question was useful for my learning for this tip. Below is a simple example.

Class A
Class B
ProgramFile.cs
All classes in different file

classA.cs
using System;
namespace class_A
{
    class classA
    {
        public void methodA()
        {
            Console.WriteLine("In Method A");
        }
    }
}

classB.cs

using System;
namespace class_B
{
    class classB
    {
        public void methodB()
        {
            Console.WriteLine("In Method B");
        }
    }
}

program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using class_A;
using class_B;
namespace ClassExamples
{
    class Program
    {
        static void Main(string[] args)
        {
            classA A = new classA();
            classB B = new classB();
            A.methodA();
            B.methodB();
            Console.ReadLine();
        }
    }
}

Tip #4

• Working with Log4Net
• The following two posts link1, link2 were useful to get started.
• Below is simple Windows Forms App
• Add the Log4Net DLL in project references

 LogHelper.cs

using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;
using log4net.Config;
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
[assembly: log4net.Config.Repository()]
namespace loggingns
{
    public class Loghelper
    {
        #region Data Members
        public static readonly ILog testLogger = LogManager.GetLogger("log4NetExample");
        #endregion
    }
}

Program.cs
Invoke the following method to log entries . Use the namespace loggingns in Form1.cs.

using log4net;
using log4net.Config;
using log4net.Core;
using loggingns;

Sample Test method

        public void testMethod()
        {
            Loghelper.testLogger.Debug("Debug Log");
            Loghelper.testLogger.Info("Info Log");
        }
App.config file entry
<?xml version="1.0" encoding="utf-8" ?>

<configuration>

      <configSections>

            <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />

      </configSections>

      <appSettings file="" >

            <clear/>

             <add key="log4net.Internal.Debug" value="false"/>

      </appSettings>

      <!-- This section contains the log4net configuration settings -->

      <log4net debug="true">

            <appender name="LogFileAppender" type="log4net.Appender.FileAppender">

                  <layout type="log4net.Layout.XMLLayout" /> -->

                  <param name="File" value="TestLoggerExample.log"/>

                  <param name="AppendToFile" value="false" />

                  <layout type="log4net.Layout.PatternLayout">

                        <header type="log4net.Util.PatternString" value="[START LOG] %newline" />

                        <footer type="log4net.Util.PatternString" value="[END LOG] %newline" />

                        <conversionPattern value="%d [%t] %-5p - %m%n"/>

                  </layout>

                  <filter type="log4net.Filter.LevelRangeFilter">

                        <param name="LevelMin" value="INFO"/>

                        <param name="LevelMax" value="INFO"/>

                  </filter>

            </appender>

            <!-- Setup the root category, add the appenders and set the default level -->

            <root>

                  <level value="ALL" />

                  <appender-ref ref="LogFileAppender" />

            </root>

            <!-- Specify the level for some specific categories -->

            <logger name="log4NetExample">

                  <!-- <appender-ref ref="B" /> -->

                  <level value="ALL" />

                  <appender-ref ref="LogFileAppender" />

            </logger>

      </log4net>

</configuration>

I hope these tips would help for future reference.

More Reads
N-Tier Architecture Best Practices, Part 1: 2-Tier Architecture with just a Data
N-Tier Architecture Best Practices, Part 2: 3-Tier Architecture with interfaces and a Data Tier


Happy Learning!!