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Constructors in C# with Example

*PTR–    Point To Remember

A constructor is a method in the class which gets executed when its object is created is called as constructor.

Constructors can be classified into 5 types

  1. Default Constructor
  2. Parameterized Constructor
  3. Copy Constructor
  4. Static Constructor
  5. Private Constructor

Default Constructor : A constructor without any parameters is called as default constructor.

 Public ConstTest()


      //Default Constructor


PTR:  every instance of the class will be initialized to same values Not Different values

Parameterized Constructor :A constructor with at least one parameter is called as parameterized constructor.

Public ConstTest (Int X ,Int Y)


      //Parameterized Constructor


PTR: you can initialize each instance of the class to different values

Copy Constructor: A parameterized constructor that contains a parameter of same class type is called as copy constructor.

Public ConstTest ()


      //Default Constructor



Public ConstTest (ConstTest T )


      //Copy Constructor

          // Access The property of T.name


PTR: initialize new instance to the values of an existing instance.

Static Constructor : You can create a constructor as static and when a constructor is created as static

Static  ConstTest ()


      //Static Constructor


PTR: it will be invoked only once for any number of instances of the class and it is during the creation of first instance of the class

Private Constructor :You can also create a constructor as private. When a class contains at least one private constructor

Private  ConstTest ()


      //private Constructor


PTR: restrict the class from being instantiated

What are extension methods?

What are extension methods?

This method allows us to add a new static method to the existing classes.


class Program
        static void Main(string[] args)
            int x = 3;
    public static class MyMathExtension
        public static int factorial(this int x)
            if (x <= 1) return 1;
            if (x == 2) return 2;
                return x * factorial(x – 1);
Use Of This

  1.     Extension methods allow existing classes to be extended without relying on inheritance or having to change the class’s source code.
  2.     If the class is sealed than there in no concept of extending its functionality. For this a new concept is introduced i.e. extension methods.
  3.     This feature is important for all developers especially if you would like to use the dynamism of the C# enhancements to be taken place in your classes design.

Important points while using extension methods:

  1.     An extension method must be defined in a top-level static class.
  2.     An extension method with the same name and signature as an instance method will not be called.
  3.     Extension methods cannot be used to override existing methods.
  4.     The concept of extension methods cannot be applied to fields, properties or events.
  5.     Overuse of extension methods is not good style of programming.

encrypt decrypt password asp.net with c#.


using System.Text;

private string Encryptdata(string password)
        string strmsg = string.Empty;
        byte[] encode = new byte[password.Length];
        encode = Encoding.UTF8.GetBytes(password);
        strmsg = Convert.ToBase64String(encode);
        return strmsg;

private string Decryptdata(string encryptpwd)
        string decryptpwd = string.Empty;
        UTF8Encoding encodepwd = new UTF8Encoding();
        Decoder Decode = encodepwd.GetDecoder();
        byte[] todecode_byte = Convert.FromBase64String(encryptpwd);
        int charCount = Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
        char[] decoded_char = new char[charCount];
        Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
        decryptpwd = new String(decoded_char);
        return decryptpwd;

string strpassword = Encryptdata(TextBox1.Text); //Enc

string strpassword = Decryptdata(TextBox1.Text); //Dec

pop up window in html5?

<style type=”text/css”>
position: fixed;
font-family: Arial, Helvetica, sans-serif;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: rgba(0,0,0,0.8);
z-index: 99999;
opacity: 0;
-webkit-transition: opacity 400ms ease-in;
-moz-transition: opacity 400ms ease-in;
transition: opacity 400ms ease-in;
pointer-events: none;

opacity: 1;
pointer-events: auto;

.modalDialog > div
width: 150px;
position: relative;
margin: 10% auto;
padding: 5px 20px 13px 20px;
border-radius: 10px;
background: #fff;
background: -moz-linear-gradient(#fff, #999);
background: -webkit-linear-gradient(#fff, #999);
background: -o-linear-gradient(#fff, #999);
height: 150px;

background: #606061;
color: #FFFFFF;
line-height: 25px;
position: absolute;
right: -12px;
text-align: center;
top: -10px;
width: 24px;
text-decoration: none;
font-weight: bold;
-webkit-border-radius: 12px;
-moz-border-radius: 12px;
border-radius: 12px;
-moz-box-shadow: 1px 1px 3px #000;
-webkit-box-shadow: 1px 1px 3px #000;
box-shadow: 1px 1px 3px #000;

background: #00d9ff;
<a id=”openModal1″ href=”#openModal”><span>HTML 5 POP UP</span></a>
<div id=”openModal” class=”modalDialog”>
<a href=”#close” title=”Close”>X</a>
Pop Window
This is pop window in html5 without jquery .

  <script src=”http://maps.google.com/maps/api/js?v=3&sensor=false&#8221; type=”text/javascript”></script>   

<script language=”javascript” type=”text/javascript”>

        var map;
        var geocoder;
        function InitializeMap() {

           var latlng = new google.maps.LatLng(0, 0);
            var myOptions =
            zoom: 6,
            center: latlng,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            disableDefaultUI: true
        map = new google.maps.Map(document.getElementById(“map”), myOptions);

        function FindLocaiton(address1) {
            geocoder = new google.maps.Geocoder();

            var address = address1;
            geocoder.geocode({ ‘address’: address }, function (results, status) {
                if (status == google.maps.GeocoderStatus.OK) {
                  var marker = new google.maps.Marker({
                       map: map,
                       position: results[0].geometry.location

                else {
                    alert(“Geocode was not successful for the following reason: ” + status);



page Desing
<div id=”map”  style=”width:600px; height:400px;”x”>

<div style=”float: left; width: 100%; margin-bottom: 20px;”>
<div style=”height:48px; padding:0px; line-height:48px; padding-left:68px;” id=”Addedproduct”  runat=”server”>

Find Your Local Stores:
<asp:TextBox ID=”txt_search”  runat=”server” ></asp:TextBox>

<asp:button type=”Submit” runat=”server”  text=”Search”  style=”border: none;” id=”btn_Search”
onclick=”btn_Search_Click” ></asp:button>

Button Coding

 protected void btn_Search_Click(object sender, EventArgs e)
       ClientScript.RegisterStartupScript(this.GetType(), “FindLocaiton”, string.Format(“FindLocaiton(‘{0}’);”, txt_search.Text), true);



google map in asp.net?


1)<script src=”http://maps.google.com/maps/api/js?v=3&sensor=false&#8221; type=”text/javascript”></script>

2) Database Structure

S.No Lattitude Longitude Cityname
1 27.19912 73.74092 Nagaur

Javascript Code:

<script src=”http://maps.google.com/maps/api/js?v=3&sensor=false&#8221; type=”text/javascript”></script>

<script type=”text/javascript”>

             var icon = new google.maps.MarkerImage(“http://maps.google.com/mapfiles/ms/micons/blue.png&#8221;,

            new google.maps.Size(32, 32), new google.maps.Point(0, 0),

            new google.maps.Point(16, 32));

        var center = null;

        var map = null;

        var currentPopup;

        var bounds = new google.maps.LatLngBounds();

          var rendererOptions = {

            draggable: true


         var directionsDisplay = new google.maps.DirectionsRenderer(rendererOptions);

        var directionsService = new google.maps.DirectionsService();

        var australia = new google.maps.LatLng(28.64186, 77.29457);

           function addMarker(lat, lng, info) {

                            // alert(“lat=”+lat,+”ln=”+lng,info);


            var StoreNAme= lat.split(“{“);      

            var str = StoreNAme[0];

            var n = str.split(“:”);

            lat = n[0];

            lng = n[1];

            info = n[2];

            var pt = new google.maps.LatLng(lat, lng);



            var key = n[2];           

            key=key.replace(/ /g,”_”);

//pop box

            info= ‘<div style=”widht:300px;”><div style=”float:left; widht:30%;”><img src=”img_shop.png” style=”width: 57px;” ></div><div style=” widht:70%; margin-top: 3px;”><span>Store Name:</span><b><span>’+StoreNAme[1]+'</span></b><br /><span style=” margin-top: 5px;”>’+n[2]+'</span></div><div style=”float:left;  margin-top: 7px;”><input type=”hidden” id=”sourceAddress” name=”sourceAddress” value=’+key+’><input type=”text” size=”30″ id=”text_search” value=”” name=”txtarch”> <input type=”button” id=’+key+’  onclick=”myFunction(this)” value=”Get Direction” name=”bSearch”></div>’;


            var marker = new google.maps.Marker({

                position: pt,

                icon: icon,

                map: map



            var popup = new google.maps.InfoWindow({

                content: info,

                maxWidth: 300,




            google.maps.event.addListener(marker, “click”, function () {

                if (currentPopup != null) {


                    currentPopup = null;




                popup.open(map, marker);

                currentPopup = popup;


            google.maps.event.addListener(popup, “closeclick”, function () {


                currentPopup = null;



            google.maps.event.addListener(directionsDisplay, ‘directions_changed’,                   function () {







        function initMap() {

            map = new google.maps.Map(document.getElementById(“map”), {


                center: new google.maps.LatLng(0, 0),

                zoom: 1,

                mapTypeId: google.maps.MapTypeId.ROADMAP

               /* mapTypeControl: false,

                mapTypeControlOptions: {

                    style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR


                navigationControl: true,

                navigationControlOptions: {

                    style: google.maps.NavigationControlStyle.SMALL




            center = bounds.getCenter();



        function calcRoute(origin1,destination1) {

              var request = {

                origin: origin1,


               // waypoints: [{ location: ‘jaipur, Rajasthan’ }],

                travelMode: google.maps.TravelMode.DRIVING


            directionsService.route(request, function (response, status) {                  

                         if (status == google.maps.DirectionsStatus.OK) {






                   alert(“Location not Found”);






             var menu = document.getElementById(‘km’)




        function computeTotalDistance(result) {

            var total = 0;

            var myroute = result.routes[0];

            for (i = 0; i < myroute.legs.length; i++) {

                total += myroute.legs[i].distance.value;


            total = total / 1000.

            document.getElementById(“total”).innerHTML = total + ” km”;



       function myFunction(obj)


        var textvalue=document.getElementById(“text_search”).value;

        var sourceAddress=document.getElementById(“sourceAddress”).value;

         sourceAddress=sourceAddress.replace(/_/g,” “);

              if(textvalue !=”)

            {                calcRoute(textvalue,sourceAddress);




                alert(“Please Enter the Destination Address”);





<div id=”map”  style=”width:600px; height:400px;”x”>

//Direction Div

<div id=”directionsPanel” style=”float: left; min-height: 0px; max-height: 432px;
overflow-y: scroll; width: 100%;”>

//total Distance

<div id=”km” style=”display: none;”>
Total Distance: <span id=”total”></span>



Fill data table from database in asp.net


First call the initMap() after calling this function addMarker() Will be Called.

if (dataTable.Rows.Count > 0)


             ClientScript.RegisterStartupScript(this.GetType(), “initMap”, string.Format(“initMap();”), true);

            for (int i = 0; i < dataTable.Rows.Count; i++)


                 if (dataTable.Rows[i][“latitude”].ToString() != “” && dataTable.Rows[i][“longitude”].ToString() != “”)


                    string FinalAddress = dataTable.Rows[i][“Address1”].ToString() + “,” + dataTable.Rows[i][“StateName”].ToString() + “{” + dataTable.Rows[i][“StoreName”].ToString();

                     ClientScript.RegisterStartupScript(this.GetType(), “addMarker” + i, string.Format(“addMarker(‘{0}: {1}: {2}’);”, dataTable.Rows[i][“latitude”].ToString(), dataTable.Rows[i][“longitude”].ToString(), FinalAddress.ToString()), true);