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Matching IP Address using the Regular Expression

October 15th, 2009 Zaur Bahramov No comments

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

MatchesDemo.zip

ipOK

ipBad

 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;
         }
     }
 }
Categories: C# Tags:

Simple class with default and overloaded constructor

September 28th, 2009 Zaur Bahramov No comments

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

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. namespace Classes_002
  7. {
  8.     class Program
  9.     {
  10.         static void Main(string[] args)
  11.         {
  12.             // create new instance of the Calculate class
  13.             Calculate calc1 = new Calculate();
  14.  
  15.             // call doCalculation method with the default Constructor
  16.             Console.WriteLine(“default constructor: “ + calc1.doCalculation()+“\r”);
  17.  
  18.             // create another instance of the Calculate class
  19.             Calculate calc2 = new Calculate(100);
  20.             // call doCalculation method with the user variable passed to Constructor
  21.             Console.WriteLine(“constructor that accepted user value: “ + calc2.doCalculation() + “\r”);
  22.  
  23.             // create another instance of the Calculate class
  24.             Calculate calc3 = new Calculate();
  25.             // call doCalculation method and pass to variables directly to method0
  26.             Console.WriteLine(“method that accepts two double values: “ + calc2.doCalculation(25.35,10.12) + “\r”);
  27.             
  28.             Console.ReadKey();
  29.         }        
  30.     }
  31. }

 

Add new class Calculate.cs with the following code

  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. namespace Classes_002
  7. {
  8.     class Calculate
  9.     {
  10.         // declare private variable for the class
  11.         private int constantA;
  12.  
  13.  
  14.         // declare initial value for default Constructor
  15.         public Calculate()
  16.         {
  17.             constantA = 10;
  18.         }
  19.  
  20.  
  21.         // declare Constructor for input of user variable
  22.         public Calculate(int a)
  23.         {
  24.             constantA = a;
  25.         }
  26.  
  27.         
  28.         // method that actually does the calculation
  29.         public int doCalculation()
  30.         {
  31.             return constantA / 2;
  32.         }
  33.  
  34.         public double doCalculation(double val1, double val2)
  35.         {
  36.             return val1*val2;
  37.         }
  38.  
  39.     }
  40.  
  41.  
  42.  
  43. }

 

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

Categories: C#, Code Snippets Tags: