Extract matched data using regular expressions C# example

This example will help you understand how to extract matched data using regular expressions and display it on the console.
Watch this tutorial first on using BackReferences:




using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Text.RegularExpressions;

namespace Regex1
{
    class Program
    {
        static void Main(string[] args)
        {
            string htmlfile = CreateString();
            DisplayMatches(htmlfile);
            Console.ReadKey();

        }
        static string CreateString()
        {
            FileStream fs = new FileStream(@"C:\Users\Ship\Documents\Visual Studio 2008\Projects\Regex1\Regex1\Sample.aspx", FileMode.Open);

            StreamReader sr = new StreamReader(fs);

            string s = sr.ReadToEnd();

            return s;

        }

        static void DisplayMatches(string s)
        {
            Regex r;
            Match m;
            r = new Regex(@"href\s*=\s*(?:""(?<1>[^""]*)""|(?<1>\S+))", RegexOptions.IgnoreCase|RegexOptions.Compiled);
            for (m = r.Match(s); m.Success; m = m.NextMatch())
            {
                Console.WriteLine("Found href " + m.Groups[1] + " at "
                + m.Groups[1].Index);
            }
        }
    }
}


Video tutorial for this post will be uploaded soon.

Regards
Sameer Shaik


Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test

Topic : Serialization

These are the list of posts related to Serialization Topic :

1.How to serialize and de-serialize simple objects Part - 1
2.How to serialize and de-serialize simple objects Part - 2
3.Creating a serializable class and Writing it to a file
4.Soap Serialization using a serializable class
5.Xml Serialization and De-Serialization Example

Regards

Sameer Shaik

Monitoring File System

Hi,
I have done a simple tutorial on monitoring file systems. Please watch the video tutorials which is split in three parts:

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Part -- 1 :-



Part -- 2 :-



Part -- 3 :-



The code for the tutorial is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace MonitorFilesExample
{
    class Program
    {
        static void Main(string[] args)
        {
            Run();

        }

        public static void Run()
        {
            FileSystemWatcher Watcher = new FileSystemWatcher(Environment.GetEnvironmentVariable("USERPROFILE"));
            Watcher.Path = @"C:\My stuff\Work Stuff\Vship";
            Watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
            Watcher.Filter = "*.txt";

            //Add event handlers for all the events
            Watcher.Changed += new FileSystemEventHandler(Watcher_Changed);
            Watcher.Renamed += new RenamedEventHandler(Watcher_Renamed);
            Watcher.Deleted += new FileSystemEventHandler(Watcher_Deleted);

            Watcher.EnableRaisingEvents = true;
            Console.ReadKey();
          
        }

        static void Watcher_Deleted(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine("File : " + e.FullPath + " Change Type is : " + e.ChangeType);
        }

        static void Watcher_Renamed(object sender, RenamedEventArgs e)
        {
            Console.WriteLine("File : " + e.FullPath + " Change Type is : " + e.ChangeType);
        }

        static void Watcher_Changed(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine("File : "+e.FullPath+ " Change Type is : "+ e.ChangeType);
        }
    }
}

Regards

Sameer Shaik

Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test

Using Enumerations

Enumerations:

An enumeration is a user - defined integer type. When you declare an enumeration, you specify a set of acceptable values that instances of that enumeration can contain. Not only that, but you can give the values user - friendly names.

 {

            
color skyblue = color.blue;
int code = (int) Enum.Parse(typeof(color),skyblue.ToString());

            if (code == 101010)

            {

                Console.WriteLine("The color you have chosen is "+skyblue+" and the color code is "+ code.ToString());

                Console.ReadKey();

               

            }

           

        }

public enum color

 {

    blue = 101010,

    black = 000000,

    white = 111111

 }

Regards

Sameer Shaik

Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test

Configuring Applications

Why do you need to configure your application?
A. Once you finish creating an application, you would want to save some settings like user settings or database connection settings or information stored between different sessions etc etc. Though dot net takes cares of most of the applications settings in machine.config file, we can always override the settings in machine.config file by creating a custom config file for our application.

In this example we will see how to create our own .config file for our application and configure the .config file for our application requirements.

Video Tutorial Part -- 1



Video Tutorial Part --2




Regards
Sameer Shaik

Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test

Value Types V/S Reference Types

Value Types and Reference Types:

1. Value types are defined from System.ValueType  while the reference types are derived from System.Object.
2. The stack holds the value type variables along with return addresses.
3. The heap holds the reference type variables value.

Copying Value Types Variables:

1. If you copy one value type variable from another, a direct copy of variable value is made.

2. If you are curious how is it created on stack, then this is how it is looks on stack:

3. So now when we copy the value of a to b by using the following statement:

4. Value of a is directly copied to b.

Copying Reference Type Variables:

1. Lets create a variable of type reference. String is a built-in reference type, we will create an object of string and assign some value to it as follows:

Regards

Sameer Shaik

Tags: Microsoft MCTS exam, Learn, Tutorials, Free C#, Free Videos, Microsoft Dot Net Jobs,Microsoft Dot Net Jobs Interview, Free Training and Preparation, Jobs MCTS specialization, visual studio.net, study guide, sample questions, Exam Prep, Exam Practice Test