Matching IP Address using the Regular Expression

Zaur Bahramov — Thu, 15 Oct 2009 20:18:21 +0000

This example demonstrates the quick and simple way to match correct IP address.

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;

 namespace MatchesDemo
 {
     public partial class IPValidate : Form
     {
         public IPValidate()
         {
             InitializeComponent();
         }

         private void btnValidate_Click(object sender, EventArgs e)
         {
             // MessageBox.Show(mtxtIPAddress.Text);

             // create a regex object
             Regex checkIP = new Regex (@"\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b");

             // create match
             Match matchIP = checkIP.Match(mtxtIPAddress.Text);

             if (checkIP.IsMatch(mtxtIPAddress.Text))
             {
                 mtxtIPAddress.ForeColor = Color.Green;
             }
             else
                 mtxtIPAddress.ForeColor = Color.Red;
         }
     }
 }

Simple class with default and overloaded constructor

Zaur Bahramov — Mon, 28 Sep 2009 21:03:29 +0000

This sample demonstrates use of default constructor, overloaded constructor, method and overloaded method in C#

Create new console C# console application.

Add the following code to Program.cs

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace Classes_002
{
    class Program
    {
        static void Main(string[] args)
        {
            // create new instance of the Calculate class
            Calculate calc1 = new Calculate();
 
            // call doCalculation method with the default Constructor
            Console.WriteLine(“default constructor: “ + calc1.doCalculation()+“\r”);
 
            // create another instance of the Calculate class
            Calculate calc2 = new Calculate(100);
            // call doCalculation method with the user variable passed to Constructor
            Console.WriteLine(“constructor that accepted user value: “ + calc2.doCalculation() + “\r”);
 
            // create another instance of the Calculate class
            Calculate calc3 = new Calculate();
            // call doCalculation method and pass to variables directly to method0
            Console.WriteLine(“method that accepts two double values: “ + calc2.doCalculation(25.35,10.12) + “\r”);
            
            Console.ReadKey();
        }        
    }
}

Add new class Calculate.cs with the following code

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace Classes_002
{
    class Calculate
    {
        // declare private variable for the class
        private int constantA;
 
 
        // declare initial value for default Constructor
        public Calculate()
        {
            constantA = 10;
        }
 
 
        // declare Constructor for input of user variable
        public Calculate(int a)
        {
            constantA = a;
        }
 
        
        // method that actually does the calculation
        public int doCalculation()
        {
            return constantA / 2;
        }
 
        public double doCalculation(double val1, double val2)
        {
            return val1*val2;
        }
 
    }
 
 
 
}

This is a very simple example just to demonstrate how default and overloaded constructors work in C#.

Bahramov's Personal Blog » C#

Matching IP Address using the Regular Expression

Simple class with default and overloaded constructor